IP over IPv6 Tunnels. Information About IP over IPv6 Tunnels. GRE IPv4 Tunnel Support for IPv6 Traffic
|
|
|
- Dayna May
- 6 years ago
- Views:
Transcription
1 IPv6 supports IP over IPv6 tunnels, which includes the following: Generic routing encapsulation (GRE) IPv4 tunnel support for IPv6 traffic IPv6 traffic can be carried over IPv4 GRE tunnels using the standard GRE tunneling technique that is designed to provide the services to implement any standard point-to-point encapsulation scheme. The primary use of GRE tunnels is for stable connections that require regular secure communication between two edge devices or between an edge device and an end system. The edge devices and the end systems must be dual-stack implementations. GRE support over IPv6 transport GRE has a protocol field that identifies the passenger protocol. GRE tunnels allow Intermediate System-to-Intermediate System (IS-IS) or IPv6 to be specified as a passenger protocol, which allows both IS-IS and IPv6 traffic to run over the same tunnel. VRF-aware IPv4/IPv6 over IPv6 tunnels - Virtual Routing and Forwarding (VRF)-aware tunnels are used to connect customer networks separated by untrusted core networks or core networks with different infrastructures (IPv4 or IPv6). Information About, page 1 How to Configure, page 2 Configuration Examples for, page 4 Additional References, page 8 Feature Information for, page 9 Information About GRE IPv4 Tunnel Support for IPv6 Traffic IPv6 traffic can be carried over IPv4 GRE tunnels using the standard GRE tunneling technique that is designed to provide the services to implement any standard point-to-point encapsulation scheme. As in IPv6 manually configured tunnels, GRE tunnels are links between two points, with a separate tunnel for each link. The tunnels are not tied to a specific passenger or transport protocol but, in this case, carry IPv6 as the passenger protocol with the GRE as the carrier protocol and IPv4 or IPv6 as the transport protocol. 1
2 GRE Support over IPv6 Transport The primary use of GRE tunnels is for stable connections that require regular secure communication between two edge devices or between an edge device and an end system. The edge devices and the end systems must be dual-stack implementations. GRE Support over IPv6 Transport GRE has a protocol field that identifies the passenger protocol. GRE tunnels allow Intermediate System-to-Intermediate System (IS-IS) or IPv6 to be specified as a passenger protocol, which allows both IS-IS and IPv6 traffic to run over the same tunnel. If GRE did not have a protocol field, it would be impossible to distinguish whether the tunnel was carrying IS-IS or IPv6 packets. The GRE protocol field makes it desirable to tunnel IS-IS and IPv6 inside GRE. How to Configure The following tasks describe how to configure an IPv6 tunnel. IPv6 or IPv4 packets can be forwarded on this tunnel. Configuring GRE IPv6 Tunnels Perform this task to configure a GRE tunnel on an IPv6 network. GRE tunnels can be configured to run over an IPv6 network layer and transport IPv6 and IPv4 packets through IPv6 tunnels. Note You must enable IPv6 or configure IPv6 MTU size more than 1500 on a tunnel's interface to avoid receiving warning messages. Before You Begin When GRE IPv6 tunnels are configured, IPv6 addresses are assigned to the tunnel source and the tunnel destination. The tunnel interface can have either IPv4 or IPv6 addresses (this is not shown in the task below). The host or device at each end of the configured tunnel must support both IPv4 and IPv6 protocol stacks. SUMMARY STEPS 1. enable 2. configure terminal 3. interface tunnel tunnel-number 4. tunnel source {ipv6-address interface-type interface-number} 5. tunnel destination ipv6-address 6. tunnel mode gre ipv6 7. end 2
3 Configuring GRE IPv6 Tunnels DETAILED STEPS Step 1 Step 2 Command or Action enable Device> enable configure terminal Purpose Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal interface tunnel tunnel-number Device(config)# interface tunnel 0 Specifies a tunnel interface and number and enters interface configuration mode. Step 4 Step 5 Step 6 Step 7 tunnel source {ipv6-address interface-type interface-number} Device(config-if)# tunnel source ethernet 0 tunnel destination ipv6-address Device(config-if)# tunnel destination 2001:0DB8:0C18:2::300 tunnel mode gre ipv6 Device(config-if)# tunnel mode gre ipv6 end Device(config-if)# end Specifies the source IPv6 address or the source interface type and number for the tunnel interface. Note If an interface type and number are specified, the interface must be configured with an IPv6 address. Only the syntax used in this context is displayed. For more details, see the IPv6 Command Reference. Specifies the destination IPv6 address for the tunnel interface. Note Only the syntax used in this context is displayed. For more details, see the IPv6 Command Reference. Specifies a GRE IPv6 tunnel. Note The tunnel mode gre ipv6 command specifies GRE as the encapsulation protocol for the tunnel interface. Only the syntax used in this context is displayed. For more details, see the IPv6 Command Reference. Exits interface configuration mode and returns to privileged EXEC mode. 3
4 Configuration Examples for Configuration Examples for IPv6 over IPv6 Tunnel Configuring CE1 ipv6 address 2001:DB8:2:1::1/64 ipv6 route 2001:DB8:2:5::/ :DB8:2:1::2 ipv6 route 2001:DB8:2:9::/ :DB8:2:1::2 Configuring PE1 interface Tunnel0 ipv6 address 2001:DB8:2:9::1/64 tunnel source 2001:DB8:2:2::1 tunnel mode ipv6 tunnel destination 2001:DB8:2:4::2 ipv6 address 2001:DB8:2:1::2/64 interface Ethernet1/1 ipv6 address 2001:DB8:2:2::1/64 ipv6 route 2001:DB8:2:3::/ :DB8:2:2::2 ipv6 route 2001:DB8:2:4::/ :DB8:2:2::2 ipv6 route 2001:DB8:2:5::/64 Tunnel0 2001:DB8:2:9::2 Configuring PE2 4
5 IPv6 over IPv6 Tunnel interface Tunnel0 ipv6 address 2001:DB8:2:9::2/64 tunnel source 2001:DB8:2:4::2 tunnel mode ipv6 tunnel destination 2001:DB8:2:2::1 ipv6 address 2001:DB8:2:5::1/64 interface Ethernet0/1 ipv6 address 2001:DB8:2:4::2/64 ipv6 route 2001:DB8:2:2::/ :DB8:2:4::1 ipv6 route 2001:DB8:2:3::/ :DB8:2:4::1 ipv6 route 2001:DB8:2:1::/64 Tunnel0 2001:DB8:2:9::1 Configuring CE2 ipv6 address 2001:DB8:2:5::2/64 ipv6 route 2001:DB8:2:1::/ :DB8:2:5::1 ipv6 route 2001:DB8:2:9::/ :DB8:2:5::1 Configuring Core Device 1 interface Ethernet1/0 ipv6 address 2001:DB8:2:3::1/64 interface Ethernet1/1 ipv6 address 2001:DB8:2:2::2/64 ipv6 route 2001:DB8:2:4::/ :DB8:2:3::2 5
6 IPv4 over IPv6 Tunnel Configuring Core Device 2 interface Ethernet0/1 ipv6 address 2001:DB8:2:4::1/64 interface Ethernet1/0 ipv6 address 2001:DB8:2:3::2/64 ipv6 route 2001:DB8:2:2::/ :DB8:2:3::1 IPv4 over IPv6 Tunnel Configuring CE1 ip address ip route ip route Configuring PE1 interface Tunnel0 ip address tunnel source 2001:DB8:2:2::1 tunnel destination 2001:DB8:2:4::2 tunnel mode ipv6 ip address interface Ethernet1/1 ipv6 address 2001:DB8:2:2::1/64 6
7 IPv4 over IPv6 Tunnel ipv6 route 2001:DB8:2:3::/ :DB8:2:2::2 ipv6 route 2001:DB8:2:4::/ :DB8:2:2::2 ip route Tunnel Configuring PE2 interface Tunnel0 ip address tunnel source 2001:DB8:2:4::2 tunnel destination 2001:DB8:2:2::1 tunnel mode ipv6 ip address interface Ethernet0/1 ipv6 address 2001:DB8:2:4::2/64 ipv6 route 2001:DB8:2:2::/ :DB8:2:4::1 ipv6 route 2001:DB8:2:3::/ :DB8:2:4::1 ip route Tunnel Configuring CE2 ip address ip route ip route Configuring Core Device 1 interface Ethernet1/0 7
8 Additional References ipv6 address 2001:DB8:2:3::1/64 interface Ethernet1/1 ipv6 address 2001:DB8:2:2::2/64 ipv6 route 2001:DB8:2:4::/ :DB8:2:3::2 Configuring Core Device 2 interface Ethernet0/1 ipv6 address 2001:DB8:2:4::1/64 interface Ethernet1/0 ipv6 address 2001:DB8:2:3::2/64 ipv6 route 2001:DB8:2:2::/ :DB8:2:3::1 Additional References Related Documents Related Topic Cisco IOS commands IPv6 commands IPv6 addressing and connectivity Cisco IOS IPv6 features Document Title Cisco IOS Master Command List, All Releases Cisco IOS IPv6 Command Reference IPv6 Configuration Guide Cisco IOS IPv6 Feature Mapping Standards and RFCs Standard/RFC RFCs for IPv6 Title IPv6 RFC 8
9 Feature Information for Technical Assistance Description The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. Link Feature Information for The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. Table 1: Feature Information for Feature Name Releases 12.2(30)S 12.2(33)SRA 12.3(7)T (2)T 15.0(1)S Cisco IOS XE Release (1)SY Feature Information feature is supported. The following commands were introduced or modified: tunnel destination, tunnel mode ipv6, tunnel mode gre ipv6, tunnel source. 9
10 Feature Information for 10
IPv6 over IPv4 GRE Tunnels
GRE tunnels are links between two points, with a separate tunnel for each link. The tunnels are not tied to a specific passenger or transport protocol, but in this case carry IPv6 as the passenger protocol
IPv6 over IPv4 GRE Tunnels
GRE tunnels are links between two points, with a separate tunnel for each link. The tunnels are not tied to a specific passenger or transport protocol, but in this case carry IPv6 as the passenger protocol
IPv6 over IPv4 GRE Tunnels
GRE tunnels are links between two points, with a separate tunnel for each link. The tunnels are not tied to a specific passenger or transport protocol, but in this case carry IPv6 as the passenger protocol
MPLS over GRE. Finding Feature Information. Prerequisites for MPLS VPN L3VPN over GRE
The feature provides a mechanism for tunneling Multiprotocol Label Switching (MPLS) packets over a non-mpls network. This feature utilizes MPLS over generic routing encapsulation (MPLSoGRE) to encapsulate
Manually Configured IPv6 over IPv4 Tunnels
This feature provides support for manually configured IPv6 over IPv4 tunnels. A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. Finding Feature
BGP-MVPN SAFI 129 IPv6
Subsequent Address Family Identifier (SAFI) 129, known as VPN Multicast SAFI, provides the capability to support multicast routing in the service provider's core IPv6 network. Border Gateway Protocol (BGP)
BGP mvpn BGP safi IPv4
The BGP mvpn BGP safi 129 IPv4 feature provides the capability to support multicast routing in the service provider s core IPv4 network This feature is needed to support BGP-based MVPNs BGP MVPN provides
Match-in-VRF Support for NAT
The feature supports Network Address Translation (NAT) of packets that communicate between two hosts within the same VPN routing and forwarding (VRF) instance. In intra-vpn NAT, both the local and global
NAT Routemaps Outside-to-Inside Support
The feature enables you to configure a NAT routemap configuration that allows IP sessions to be initiated from outside the network to inside the network. This module explains how to configure the feature.
Fine-Grain NBAR for Selective Applications
By default NBAR operates in the fine-grain mode, offering NBAR's full application recognition capabilities. Used when per-packet reporting is required, fine-grain mode offers a troubleshooting advantage.
BGP Graceful Shutdown
The feature reduces or eliminates the loss of traffic along a link being shut down for maintenance. Routers always have a valid route available during the convergence process. This feature is used primarily
Using Flexible NetFlow Flow Sampling
This document contains information about and instructions for configuring sampling to reduce the CPU overhead of analyzing traffic with Flexible NetFlow. NetFlow is a Cisco technology that provides statistics
Using Flexible NetFlow Flow Sampling
This document contains information about and instructions for configuring sampling to reduce the CPU overhead of analyzing traffic with Flexible NetFlow. NetFlow is a Cisco technology that provides statistics
Flexible NetFlow - MPLS Support
The feature supports the monitoring of the following MPLS-related fields: MPLS Labels 1-6 (3 bytes -- 20 bits of label, 3 bits of EXP, 1 bit of EOS). Top Label EXP i.e. the EXP field for label 1. Top Label
Configuring System MTU
Restrictions for System MTU, on page 1 Information About the MTU, on page 1 How to Configure MTU, on page 2 Configuration Examples for System MTU, on page 4 Additional References for System MTU, on page
IPv6 Switching: Provider Edge Router over MPLS
Multiprotocol Label Switching (MPLS) is deployed by many service providers in their IPv4 networks. Service providers want to introduce IPv6 services to their customers, but changes to their existing IPv4
Quality of Service for VPNs
The QoS for VPNs feature provides a solution for making Cisco IOS QoS services operate in conjunction with tunneling and encryption on an interface. Cisco IOS software can classify packets and apply the
Fine-Grain NBAR for Selective Applications
By default NBAR operates in the fine-grain mode, offering NBAR's full application recognition capabilities. Used when per-packet reporting is required, fine-grain mode offers a troubleshooting advantage.
IPv6 Switching: Provider Edge Router over MPLS
Multiprotocol Label Switching (MPLS) is deployed by many service providers in their IPv4 networks. Service providers want to introduce IPv6 services to their customers, but changes to their existing IPv4
DHCP Relay Server ID Override and Link Selection Option 82 Suboptions
DHCP Relay Server ID Override and Link Selection Option 82 Suboptions The DHCP Relay Server ID Override and Link Selection Option 82 Suboptions feature enables the relay agent to be part of all Dynamic
IPv6 Multicast: Bootstrap Router
Finding Feature Information, page 1 Information About, page 1 How to Configure, page 3 Configuration Examples for, page 8 Additional References, page 8 Feature Information for, page 9 Finding Feature Information
IS-IS IPv6 Administrative Tag
The feature allows you to assign a tag to IPv6 prefixes that you can use to apply administrative policies with a route map. For example, you can control routes redistributed between area and domain boundaries
BGP Route-Map Continue
The feature introduces the continue clause to BGP route-map configuration. The continue clause allows for more programmable policy configuration and route filtering and introduces the capability to execute
Flexible NetFlow IPFIX Export Format
The feature enables sending export packets using the IPFIX export protocol. The export of extracted fields from NBAR is only supported over IPFIX. Finding Feature Information, page 1 Information About,
BGP Named Community Lists
The feature allows the network operator to assign meaningful names to community lists and increases the number of community lists that can be configured. Finding Feature Information, page 1 Information
ACL Syslog Correlation
The Access Control List (ACL) Syslog Correlation feature appends a tag (either a user-defined cookie or a device-generated MD5 hash value) to access control entry (ACE) syslog entries. This tag uniquely
Sun RPC ALG Support for Firewalls and NAT
The feature adds support for the Sun Microsystems remote-procedure call (RPC) application-level gateway (ALG) on the firewall and Network Address Translation (NAT). Sun RPC is an application layer protocol
Sun RPC ALG Support for Firewalls and NAT
The feature adds support for the Sun Microsystems remote-procedure call (RPC) application-level gateway (ALG) on the firewall and Network Address Translation (NAT). Sun RPC is an application layer protocol
QoS Group Match and Set for Classification and Marking
QoS Group Match and Set for Classification and Marking This feature provides the capability of matching and classifying traffic on the basis of the QoS group value. Finding Feature Information, on page
IPv6 Multicast Listener Discovery Protocol
Finding Feature Information, page 1 Information About, page 1 How to Configure, page 4 Configuration Examples for, page 10 Additional References, page 11, page 12 Finding Feature Information Your software
DHCP Client. Finding Feature Information. Restrictions for the DHCP Client
The Cisco Dynamic Host Configuration Protocol (DHCP) Client feature allows a Cisco device to act as a host requesting configuration parameters, such as an IP address, from a DHCP server. Finding Feature
EIGRP Route Tag Enhancements
The feature enables you to specify and display route tags in dotted-decimal format, filter routes using the route tag value with wildcard mask, and set a default route tag for all internal Enhanced Interior
Autoroute Announce and Forwarding Adjacencies For OSPFv3
Autoroute Announce and Forwarding The Autoroute Announce and Forwarding Adjacencies for OSPFv3 feature advertises IPv6 routes over MPLS/TE IPv4 tunnels. This module describes how to configure the Autoroute
Autoroute Announce and Forwarding Adjacencies For OSPFv3
Autoroute Announce and Forwarding The Autoroute Announce and Forwarding Adjacencies for OSPFv3 feature advertises IPv6 routes over MPLS/TE IPv4 tunnels. This module describes how to configure the Autoroute
IPv6 Snooping. Finding Feature Information. Restrictions for IPv6 Snooping
The feature bundles several Layer 2 IPv6 first-hop security features, including IPv6 neighbor discovery inspection, IPv6 device tracking, IPv6 address glean, and IPv6 binding table recovery, to provide
Add Path Support in EIGRP
The feature enables hubs in a single Dynamic Multipoint VPN (DMVPN) domain to advertise multiple best paths to connected spokes when the Enhanced Interior Gateway Routing Protocol (EIGRP) is the routing
IS-IS Inbound Filtering
The Intermediate System-to-Intermediate System (IS-IS) Inbound Filtering feature prevents unwanted IS-IS routes from being installed in a routing table. A user can deny or permit a route from being installed
MPLS VPN Multipath Support for Inter-AS VPNs
The feature supports Virtual Private Network (VPN)v4 multipath for Autonomous System Boundary Routers (ASBRs) in the interautonomous system (Inter-AS) Multiprotocol Label Switching (MPLS) VPN environment.
Bulk Logging and Port Block Allocation
The feature allocates a block of ports for translation instead of allocating individual ports. This feature is supported only in carrier-grade Network Address Translation (CGN) mode. This module provides
Configuring IP SLAs UDP Echo Operations
This module describes how to configure an IP Service Level Agreements (SLAs) User Datagram Protocol (UDP) Echo operation to monitor end-to-end response time between a Cisco device and devices using IPv4
Restrictions for Disabling Flow Cache Entries in NAT and NAT64
The feature allows you to disable flow cache entries for dynamic and static Network Address Translation (NAT) translations. Disabling flow cache entries for dynamic and static translations saves memory
VLANs over IP Unnumbered SubInterfaces
The VLANs over IP Unnumbered Subinterfaces feature allows IP unnumbered interface support to be configured on Ethernet VLAN subinterfaces. This feature also provides support for DHCP on VLAN subinterfaces.
EIGRP Support for Route Map Filtering
The feature enables Enhanced Interior Gateway Routing Protocol (EIGRP) to interoperate with other protocols to leverage additional routing functionality by filtering inbound and outbound traffic based
Static NAT Mapping with HSRP
This module contains procedures for configuring Network Address Translation (NAT) to support the increasing need for highly resilient IP networks. This network resiliency is required where application
Regulating Packet Flow on a Per-Interface Basis Using Generic Traffic Shaping
Regulating Packet Flow on a Per-Interface Basis Using Generic Traffic Shaping Packet flow on a network can be regulated using a traffic shaping mechanism. One such traffic shaping mechanism is a Cisco
Carrier Grade Network Address Translation
(CGN) is a large-scale NAT that translates private IPv4 addresses into public IPv4 addresses. CGN employs Network Address and Port Translation methods to aggregate multiple private IPv4 addresses into
PIM Allow RP. Finding Feature Information. Restrictions for PIM Allow RP
This module describes how to configure the feature in IPv4 or IPv6 networks for inter-connecting Protocol Independent Multicast (PIM) Sparse Mode (SM) domains with different rendezvous points (RPs). enables
EIGRP Stub Routing. Finding Feature Information. Information About EIGRP Stub Routing. EIGRP Stub Routing
The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Stub routing is commonly used in hub-and-spoke network topologies.
Configuring NSF-OSPF
This module describes how to configure Nonstop Forwarding (NSF) in Cisco software to minimize the duration for which a network is unavailable to its users after a switchover. The main objective of NSF
IPv6 First-Hop Security Binding Table
IPv6 First-Hop Security Binding Table Last Updated: July 25, 2012 A database table of IPv6 neighbors connected to a device is created from information sources such as Neighbor Discovery Protocol (NDP)
Server Groups in Outbound Dial Peers
This feature configures a server group (group of server addresses) that can be referenced from an outbound dial peer. Feature Information for Configuring, page 1 Information About, page 2 How to Configure,
You can specify IPv4 and IPv6 addresses while performing various tasks in this feature. The resource
The feature enables the configuration of a Virtual Private Network (VPN) routing and forwarding instance (VRF) table so that the domain name system (DNS) can forward queries to name servers using the VRF
Configuring IP SLAs TCP Connect Operations
This module describes how to configure an IP Service Level Agreements (SLAs) TCP Connect operation to measure the response time taken to perform a TCP Connect operation between a Cisco router and devices
FPG Endpoint Agnostic Port Allocation
When the Endpoint Agnostic Port Allocation feature is configured, an entry is added to the Symmetric Port Database. If the entry is already available, the port listed in the Symmetric Port Database is
Configuring IP SLAs FTP Operations
This module describes how to configure an IP Service Level Agreements (SLAs) File Transfer Protocol (FTP) operation to measure the response time between a Cisco device and an FTP server to retrieve a file.
BGP-VPN Distinguisher Attribute
The BGP VPN Distinguisher Attribute feature allows a network administrator to keep source route targets (RTs) private from an Autonomous System Border Router (ASBR) in a destination autonomous system.
Flexible NetFlow Full Flow support
Flexible NetFlow Full Flow support Last Updated: January 29, 2013 The Flexible NetFlow - Full Flow support feature enables Flexible NetFlow to collect flow records for every packet. Finding Feature Information,
Multi-VRF Support. Finding Feature Information. Prerequisites for Multi-VRF Support
The feature allows you to configure and maintain more than one instance of a routing and forwarding table within the same customer edge (CE) device. Finding Feature Information, page 1 Prerequisites for,
Object Tracking: IPv6 Route Tracking
The feature expands the Enhanced Object Tracking (EOT) functionality to allow the tracking of IPv6 routes. Finding Feature Information, page 1 Restrictions for, page 1 Information About, page 2 How to
Multicast only Fast Re-Route
(MoFRR) is an IP solution that minimizes packet loss in a network when there is a link or node failure. It works by making simple enhancements to multicast routing protocols like Protocol Independent Multicast
IPv6 Neighbor Discovery
The IPv6 neighbor discovery process uses Internet Control Message Protocol (ICMP) messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local
Nested Class Map Support for Zone-Based Policy Firewall
Nested Class Map Support for Zone-Based Policy Firewall The Nested Class Map Support for Zone-Based Policy Firewall feature provides the Cisco IOS XE firewall the functionality to configure multiple traffic
Configuring IP SLAs ICMP Echo Operations
This module describes how to configure an IP Service Level Agreements (SLAs) Internet Control Message Protocol (ICMP) Echo operation to monitor end-to-end response time between a Cisco router and devices
Implementing IP in IP Tunnel
This chapter module provides conceptual and configuration information for IP in IP tunnels on Cisco ASR 9000 Series Router. Note For a complete description of the IP in IP tunnel commands listed in this
IPv6 Stateless Autoconfiguration
The IPv6 stateless autoconfiguration feature can be used to manage link, subnet, and site addressing changes. Information About, page 1 How to Configure, page 2 Configuration Examples for, page 3 Additional
OSPFv3 Address Families
The Open Shortest Path First version 3 (OSPFv3) address families feature enables both IPv4 and IPv6 unicast traffic to be supported. With this feature, users may have two processes per interface, but only
VRRPv3 Protocol Support
Virtual Router Redundancy Protocol (VRRP) enables a group of routers to form a single virtual router to provide redundancy. The LAN clients can then be configured with the virtual router as their default
RFC 430x IPsec Support
The includes features Phase 1 and RFC430x IPsec Support Phase 2 that implement Internet Key Exchange (IKE) and IPsec behavior as specified in RFC 4301. Finding Feature Information, page 1 Information About,
QoS Tunnel Marking for GRE Tunnels
The feature introduces the capability to define and control the quality of service (QoS) for both incoming and outgoing customer traffic on the provider edge (PE) router in a service provider network.
DHCPv6 Individual Address Assignment
The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Individual Address Assignment feature manages nonduplicate address assignment in the correct prefix based on the network where the host is connected.
Port-Shaper and LLQ in the Presence of EFPs
The feature allows network designers to configure port and class policies on ports that contain Ethernet Flow Points (EFPs). These policies support Low Latency Queueing (LLQ) and traffic prioritization
DHCPv6Relay LightweightDHCPv6RelayAgent
DHCPv6Relay LightweightDHCPv6RelayAgent The DHCPv6 Relay Lightweight DHCPv6 Relay Agent feature allows relay agent information to be inserted by an access node that performs a link-layer bridging (non-routing)
Configuring the Cisco IOS DHCP Relay Agent
All Cisco devices that run Cisco software include a DHCP server and the relay agent software. A DHCP relay agent is any host or IP device that forwards DHCP packets between clients and servers. This module
ibgp Multipath Load Sharing
This feature module describes the feature. This feature enables the BGP speaking router to select multiple ibgp paths as the best paths to a destination. The best paths or multipaths are then installed
Ethernet over GRE Tunnels
The feature allows customers to leverage existing low end residential gateways to provide mobility services to mobile nodes using Proxy Mobile IPv6 (PMIPv6), General Packet Radio Service (GPRS) Tunneling
Proxy Mobile IPv6 Support for MAG Functionality
The feature provides network-based IP Mobility management to a mobile node (MN) without requiring the participation of the mobile node in any IP Mobility-related signaling. The Mobile Access Gateway (MAG)
An IPv6 unicast address is an identifier for a single interface, on a single node. A packet that is sent to a unicast
An IPv6 unicast address is an identifier for a single interface, on a single node. A packet that is sent to a unicast address is delivered to the interface identified by that address. Finding Feature Information,
HSRP MD5 Authentication
Finding Feature Information, page 1 Information About, page 1 How to Configure, page 2 Configuration Examples for, page 8 Additional References, page 9 Feature Information for, page 10 Finding Feature
OSPFv3 Address Families
The Open Shortest Path First version 3 (OSPFv3) address families feature enables both IPv4 and IPv6 unicast traffic to be supported. With this feature, users may have two processes per interface, but only
OSPFv3 Address Families
The Open Shortest Path First version 3 (OSPFv3) address families feature enables both IPv4 and IPv6 unicast traffic to be supported. With this feature, users may have two processes per interface, but only
Firewall Stateful Inspection of ICMP
The feature categorizes Internet Control Management Protocol Version 4 (ICMPv4) messages as either malicious or benign. The firewall uses stateful inspection to trust benign ICMPv4 messages that are generated
IPv6 Multicast Listener Discovery Protocol
IPv6 Multicast Listener Discovery Protocol Last Updated: October 16, 2012 IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast
Configuring IP SLAs ICMP Path Echo Operations
This module describes how to configure an IP Service Level Agreements (SLAs) Internet Control Message Protocol (ICMP) Path Echo operation to monitor end-to-end and hop-by-hop response time between a Cisco
Configuring Cache Services Using the Web Cache Communication Protocol
Configuring Cache Services Using the Web Cache Communication Protocol Finding Feature Information, page 1 Prerequisites for WCCP, page 1 Restrictions for WCCP, page 2 Information About WCCP, page 3 How
AAA Server Groups. Finding Feature Information. Information About AAA Server Groups. AAA Server Groups
Configuring a device to use authentication, authorization, and accounting (AAA) server groups provides a way to group existing server hosts. Grouping existing server hosts allows you to select a subset
BGP Dynamic Neighbors
BGP dynamic neighbor support allows BGP peering to a group of remote neighbors that are defined by a range of IP addresses. Each range can be configured as a subnet IP address. BGP dynamic neighbors are
Configuring IP SLAs ICMP Path Echo Operations
This module describes how to configure an IP Service Level Agreements (SLAs) Internet Control Message Protocol (ICMP) Path Echo operation to monitor end-to-end and hop-by-hop response time between a Cisco
BGP Event-Based VPN Import
The feature introduces a modification to the existing Border Gateway Protocol (BGP) path import process. The enhanced BGP path import is driven by events; when a BGP path changes, all of its imported copies
Configuring IP SLAs ICMP Echo Operations
This module describes how to configure an IP Service Level Agreements (SLAs) Internet Control Message Protocol (ICMP) Echo operation to monitor end-to-end response time between a Cisco router and devices
IPv6 Snooping. Finding Feature Information. Restrictions for IPv6 Snooping
The feature bundles several Layer 2 IPv6 first-hop security features, including IPv6 neighbor discovery inspection, IPv6 device tracking, IPv6 address glean, and IPv6 binding table recovery, to provide
SSL Custom Application
feature enables users to customize applications that run on any protocol over Secure Socket Layer (SSL), including HTTP over Secure Socket Layer (HTTPS), using the server name, if it exists in the Client
Mapping of Address and Port Using Translation
The feature provides connectivity to IPv4 hosts across IPv6 domains. Mapping of address and port using translation (MAP-T) is a mechanism that performs double translation (IPv4 to IPv6 and vice versa)
Configuring Firewall TCP SYN Cookie
The Firewall TCP SYN Cookie feature protects your firewall from TCP SYN-flooding attacks. TCP SYN-flooding attacks are a type of denial-of-service (DoS) attack. Usually, TCP synchronization (SYN) packets
BGP Cost Community. Prerequisites for the BGP Cost Community Feature
The feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (ibgp) and confederation peers but not to
DHCPv6Relay LightweightDHCPv6RelayAgent
DHCPv6Relay LightweightDHCPv6RelayAgent The DHCPv6 Relay Lightweight DHCPv6 Relay Agent feature allows relay agent information to be inserted by an access node that performs a link-layer bridging (non-routing)
DMVPN Event Tracing. Finding Feature Information
The feature provides a trace facility for troubleshooting Cisco IOS Dynamic Multipoint VPN (DMVPN). This feature enables you to monitor DMVPN events, errors, and exceptions. During runtime, the event trace
Stateful Network Address Translation 64
The feature provides a translation mechanism that translates IPv6 packets into IPv4 packets and vice versa. The stateful NAT64 translator algorithmically translates the IPv4 addresses of IPv4 hosts to
Flexible NetFlow IPv6 Unicast Flows
The feature enables Flexible NetFlow to monitor IPv6 traffic. Finding Feature Information, page 1 Information About Flexible NetFlow IPv6 Unicast Flows, page 1 How to Configure Flexible NetFlow IPv6 Unicast
BGP Diverse Path Using a Diverse-Path Route Reflector
BGP Diverse Path Using a Diverse-Path Route Reflector The feature allows Border Gateway Protocol (BGP) to distribute an alternative path other than the best path between BGP speakers when route reflectors
Configurable Number of Simultaneous Packets per Flow
Configurable Number of Simultaneous Packets per Flow In zone-based policy firewalls, the number of simultaneous packets per flow is restricted to 25 and packets that exceed the limit are dropped. The dropping