BFD on BDI Interfaces
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- Audra Wilson
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1 The Cisco feature alleviates limitations on the maximum number of interfaces per system that switched virtual interfaces (SVI) impose. This document describes how to configure the Bidirectional Forwarding Detection (BFD) protocol on bridge domain interfaces (BDIs). Finding Feature Information, on page 1 Information About BFD on Bridge Domain Interfaces, on page 1 How to Configure, on page 2 Configuration Examples for, on page 5 Additional s, on page 7 Feature Information for BFD on Bridge Domain Interfaces, on page 8 Finding Feature Information Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table. 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. Information About BFD on Bridge Domain Interfaces BFD on Bridge Domain Interfaces Each BDI is associated with a bridge domain on which traffic is mapped using criteria defined and configured on the associated Ethernet flow points (EFPs). You can associate either single or multiple EFPs with a given bridge domain. Thus you can establish a BFD single-hop session over BDI interfaces that are defined in either a global table or a VPN routing and forwarding (VRF) table, and all existing single-hop BFD clients will be supported for BFD over BDI. The Cisco BFD on BDI feature does not affect BFD stateful switchover (SSO) on platforms that are SSO capable. 1
2 How to Configure How to Configure Enabling BFD on a Bridge Domain Interface Perform these steps to enable single hop BFD on an individual BDI interface. Note Multihop BFD is not interface specific so you do not need BDI interface-level configuration to establish multihop BFD sessions. Before you begin Two or more nodes must be connected. SUMMARY STEPS 1. enable 2. configure terminal 3. bfd-template single-hop template-name 4. interval min-tx milliseconds min-rx milliseconds multiplier multiplier-value 5. interface type number 6. ip address ip-address mask 7. bfd template template name 8. bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier 9. exit DETAILED STEPS Step 1 Command or Action enable Purpose Enables privileged EXEC mode. Enter your password if prompted. Router> enable Step 2 configure terminal Enters global Step 3 Router# configure terminal bfd-template single-hop template-name Creates a single-hop BFD template and enters BFD Router(config)# bfd-template single-hop bfdtemplate1 2
3 Associating an Ethernet Flow Point with a Bridge Domain Step 4 Step 5 Command or Action interval min-tx milliseconds min-rx milliseconds multiplier multiplier-value Router(bfd-config)# interval min-tx 120 min-rx 100 multiplier 3 interface type number Purpose Configures the transmit and receive intervals between BFD packets, and specifies the number of consecutive BFD control packets that must be missed before BFD declares that a peer is unavailable. Configures a bridge domain interface and enters interface Step 6 Router(config)# interface bdi 100 ip address ip-address mask Configures an IP address for the interface. Step 7 Step 8 Router(config-if)# ip address bfd template template name bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier Enables the BFD template. Enables BFD on the interface. Step 9 Router(config-if)# bfd interval 500 min_rx 500 multiplier 5 exit Exits interface configuration mode and returns to global Router(config-if)# exit Associating an Ethernet Flow Point with a Bridge Domain Before you begin BFD must be enabled on both nodes. SUMMARY STEPS 1. enable 2. configure terminal 3. interface type slot/subslot/port 4. no ip address 5. negotiation auto 6. cdp enable 7. service instance id service-type 3
4 Associating an Ethernet Flow Point with a Bridge Domain 8. encapsulation dot1q vlan-id 9. rewrite ingress tag pop 1 symmetric 10. exit 11. exit 12. bridge-domain vlan-id DETAILED STEPS Step 1 Command or Action enable Purpose Enables privileged EXEC mode. Enter your password if prompted. Step 2 Router> enable configure terminal Enters global Step 3 Router# configure terminal interface type slot/subslot/port Configures an interface type and enters interface Step 4 Router(config)# interface GigabitEthernet0/0/3 no ip address Disables IP processing. Step 5 Step 6 Step 7 Step 8 Router(config-if)# no ip address negotiation auto Router(config-if)# negotiation auto cdp enable Router(config-if)# cdp enable service instance id service-type Router(config-if)# service instance 2 ethernet encapsulation dot1q vlan-id Router(config-if-srv)# encapsulation dot1q 2 Enables the autonegotiation protocol to configure the speed, duplex, and automatic flow control of the interface. Enables Cisco Discovery Protocol on the interface. Configures an Ethernet service instance and enters service instance Enables IEEE 802.1Q encapsulation of traffic on the subinterface. 4
5 Configuration Examples for Step 9 Command or Action rewrite ingress tag pop 1 symmetric Router(config-if-srv)# rewrite ingress tag pop 1 symmetric Purpose Specifies removal of the outermost tag from the frame ingressing the service instance and the addition of a tag in the egress direction. Step 10 exit Exits service instance configuration mode and returns to interface Step 11 Router(config-if)# exit exit Exits interface configuration mode and returns to global Step 12 Router(config-if)# exit bridge-domain vlan-id Router(config)# bridge-domain 2 Associates the bridge domain with the Ethernet flow point. What to do next Configuration Examples for Examples for The following example shows how to configure BFD on a BDI. Router#show bfd neighbors IPv4 Sessions NeighAddr LD/RD RH/RS State Int /1 Up Up BD2 Router# Router#show running interface gi0/0/3 Building configuration... Current configuration : 230 bytes interface GigabitEthernet0/0/3 no ip address ip pim passive ip igmp version 3 negotiation auto 5
6 Examples for cdp enable service instance 2 ethernet encapsulation dot1q 2 rewrite ingress tag pop 1 symmetric bridge-domain 2 end Router#show running interface bdi2 Building configuration... Current configuration : 127 bytes interface BDI2 ip address bfd interval 100 min_rx 100 multiplier 3 bfd neighbor ipv end And similarly for the other node: Router2#show running interface bdi2 Building configuration... Current configuration : 127 bytes interface BDI2 ip address bfd interval 100 min_rx 100 multiplier 3 bfd neighbor ipv end ED3#show run int gig0/0/3 Building configuration... Current configuration : 195 bytes interface GigabitEthernet0/0/3 no ip address negotiation auto cdp enable service instance 2 ethernet encapsulation dot1q 2 rewrite ingress tag pop 1 symmetric bridge-domain 2 end Router2#show bfd neighbors IPv4 Sessions NeighAddr LD/RD RH/RS State Int /2049 Up Up BD2 ED3# 6
7 Additional s Additional s Related Documents Related Topic Cisco IOS commands Configuring and monitoring BGP BFD hardware offload Configuring and monitoring EIGRP Configuring and monitoring HSRP Configuring and monitoring IS-IS Configuring and monitoring OSPF Document Title Cisco IOS Master Commands List, All Releases Cisco BGP Overview module of the Cisco IOS IP Routing Protocols Configuration Guide Configuring Synchronous Ethernet on the Cisco 7600 Router with ES+ Line Card section of the Cisco 7600 Series Ethernet Services Plus (ES+) and Ethernet Services Plus T (ES+T) Line Card Configuration Guide Configuring EIGRP module of the Cisco IOS IP Routing Protocols Configuration Guide Configuring HSRP module of the Cisco IOS IP Application Services Configuration Guide Configuring Integrated IS-IS module of the Cisco IOS IP Routing Protocols Configuration Guide Configuring OSPF module of the Cisco IOS IP Routing Protocols Configuration Guide BFD commands: complete command syntax, BGP commands: complete command syntax, EIGRP commands: complete command syntax, HSRP commands: complete command syntax, Cisco IOS IP Application Services Command IS-IS commands: complete command syntax, OSPF commands: complete command syntax, 7
8 Feature Information for BFD on Bridge Domain Interfaces Related Topic BFD IPv6 Encapsulation Support OSPFv3 for BFD Static Route Support for BFD over IPv6 Document Title BFD IPv6 Encapsulation Support module OSPFv3 for BFD module Static Route Support for BFD over IPv6 module Standards and RFCs Standard/RFC IETF Draft IETF Draft Title Bidirectional Forwarding Detection, February 2009 ( BFD for IPv4 and IPv6 (Single Hop), February 2009 ( 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 BFD on Bridge Domain Interfaces 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 BFD on Bridge Domain Interfaces Feature Name BFD on Bridge Domain Interfaces Releases Cisco IOS XE Release 3.5S Feature Information This feature supports BFD on Bridge Domain Interfaces. 8
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