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1 Table of Contents 1 Static Routing Configuration 1-1 Introduction 1-1 Static Route 1-1 Default Route 1-1 Application Environment of Static Routing 1-2 Configuring a Static Route 1-2 Configuration Prerequisites 1-2 Configuration Procedure 1-3 Detecting Reachability of the Static Route s Nexthop 1-3 Detecting Nexthop Reachability Through BFD 1-3 Detecting Nexthop Reachability Through Track 1-4 Displaying and Maintaining Static Routes 1-5 Static Route Configuration Example 1-6 Basic Static Route Configuration Example 1-6 i

2 1 Static Routing Configuration When configuring a static route, go to these sections for information you are interested in: Introduction Configuring a Static Route Detecting Reachability of the Static Route s Nexthop Displaying and Maintaining Static Routes Static Route Configuration Example The term router in this document refers to a router in a generic sense or a Layer 3 switch. For an S3610/S5510 switch to support the VPN instance feature and the vpn-instance keyword in related commands, you must configure it to operate in MCE mode. For details about the operating mode of a switch, refer to Dual Stack Configuration in the IP Services Volume. Layer 3 Ethernet interfaces mentioned in this section refer to Ethernet ports configured to operate in route mode. For how to switch the operating mode of an Ethernet port, refer to Ethernet Port Configuration in the Access Volume. Introduction Static Route A static route is a manually configured. If a network s topology is simple, you only need to configure static routes for the network to work normally. The proper configuration and usage of static routes can improve network performance and ensure bandwidth for important network applications. The disadvantage of using static routes is that they cannot adapt to network topology changes. If a fault or a topological change occurs in the network, the routes will be unreachable and the network breaks. In this case, the network administrator has to modify the static routes manually. Default Route If the destination address of a packet fails to match any entry in the routing table, the packet will be discarded. After a default route is configured on a router, any packet whose destination IP address matches no entry in the routing table can be forwarded to a designated upstream router. A router selects the default route only when it cannot find any matching entry in the routing table. If the destination address of a packet fails to match any entry in the routing table, the router selects the default route to forward the packet. 1-1

3 If there is no default route and the destination address of the packet fails to match any entry in the routing table, the packet will be discarded and an ICMP packet will be sent to the source to report that the destination or the network is unreachable. Default routes can be configured in two ways: The network administrator can configure a default route with both destination and mask being The router forwards any packet whose destination address fails to match any entry in the routing table to the next hop of the default static route. Some dynamic routing protocols, such as OSPF, RIP and IS-IS, can also generate a default route. For example, an upstream router running OSPF can generate a default route and advertise it to other routers, which install the default route with the next hop being the upstream router. Application Environment of Static Routing Before configuring a static route, you need to know the following concepts: 1) Destination address and mask In the ip route-static command, an IPv4 address is in dotted decimal format and a mask can be either in dotted decimal format or in the form of mask length (the digits of consecutive 1s in the mask). 2) Output interface and next hop address While configuring a static route, you can specify either the output interface or the next hop address depending on the specific occasion. The next hop address can not be a local interface IP address; otherwise, the route configuration will not take effect. In fact, all the route entries must have a next hop address. When forwarding a packet, a router first searches the routing table for the route to the destination address of the packet. The system can find the corresponding link layer address and forward the packet only after the next hop address is specified. When specifying the output interface, note that: If the output interface is a Null 0 or loopback interface, there is no need to configure the next hop address. You are not recommended to specify a broadcast interface (such as an Layer 3 Ethernet interface or VLAN interface) as the output interface, because a broadcast interface may have multiple next hops. If you have to do so, you must specify the corresponding next hop for the output interface. 3) Other attributes You can configure different preferences for different static routes so that route management policies can be applied more flexibly. For example, specifying the same preference for different routes to the same destination enables load sharing, while specifying different preferences for these routes enables route backup. Configuring a Static Route Configuration Prerequisites Before configuring a static route, you need to finish the following tasks: Configure the physical parameters for related interfaces Configure the link-layer attributes for related interfaces Configure the IP addresses for related interfaces 1-2

4 Configuration Procedure Follow these steps to configure a static route: To do Use the command Remarks Enter system view system-view Configure a static route Configure the default preference for static routes ip route-static dest-address { mask mask-length } { next-hop-address interface-type interface-number next-hop-address vpn-instance d-vpn-instance-name next-hop-address } [ preference preference-value ] [ tag tag-value ] [ description description-text ] ip route-static vpn-instance s-vpn-instance-name&<1-6> dest-address { mask mask-length } { next-hop-address [ public ] interface-type interface-number next-hop-address vpn-instance d-vpn-instance-name next-hop-address } [ preference preference-value ] [ tag tag-value ] [ description description-text ] ip route-static default-preference default-preference-value Required By default, preference for static routes is 60, tag is 0, and no description information is configured. Optional 60 by default When configuring a static route, the static route does not take effect if you specify the next hop address first and then configure it as the IP address of a local interface, such as Layer 3 Ethernet interface and VLAN interface. If you do not specify the preference when configuring a static route, the default preference will be used. Reconfiguring the default preference applies only to newly created static routes. You can flexibly control static routes by configuring tag values and using the tag values in the routing policy. If the destination IP address and mask are both configured as with the ip route-static command, the route is the default route. Detecting Reachability of the Static Route s Nexthop If a static route fails due to a topology change or a fault, the connection will be interrupted. To improve network stability, the system needs to detect reachability of the static route s next hop and switch to a backup route once the next hop is unreachable. There are two methods of detecting reachability of the static route s next hop. Note that only one of the two methods can be used at a time. Detecting Nexthop Reachability Through BFD Bidirectional forwarding detection (BFD) provides a general-purpose, standard, medium- and protocol-independent fast failure detection mechanism. It can uniformly and quickly detect the failures 1-3

5 of the bidirectional forwarding paths between two routers for upper-layer protocols, such as routing protocols. For details about BFD, refer to BFD Configuration in the IP Routing Volume. After a static route is configured, you can enable BFD to detect the reachability of the static route's nexthop. Network requirements To detect the reachability of the static route's nexthop through BFD, you need to enable BFD first. For BFD configuration, refer to BFD Configuration in the IP Routing Volume. Configuration procedure Follow these steps to detect reachability of the static route s nexthop through BFD: To do Use the command Remarks Enter system view system-view Detect reachability of the static route s nexthop through BFD ip route-static dest-address { mask mask-length } interface-type interface-number next-hop-address [ bfd { control-packet echo-packet } ] [ preference preference-value ] [ tag tag-value ] [ description description-text ] ip route-static vpn-instance s-vpn-instance-name&<1-6> dest-address { mask mask-length } interface-type interface-number next-hop-address [ bfd { control-packet echo-packet } ] [ preference preference-value ] [ tag tag-value ] [ description description-text ] Required Not configured by default To implement BFD in the control-packet mode, the remote end must create a BFD session; otherwise the BFD function cannot work. To implement BFD in the echo-packet mode, the BFD function can work without the remote end needing to create any BFD session. If a route flap occurs, enabling BFD may worsen the flapping. Be cautious for use of this feature. Detecting Nexthop Reachability Through Track If you specify the nexthop but not outgoing interface when configuring a static route, you can associate the static route with a track entry to check the static route validity: When the track entry is positive, the static route's nexthop is reachable and the static route takes effect. When the track entry is negative, the static route's nexthop is unreachable and the static route is invalid. For details about track, refer to Track Configuration in the System Volume. Network requirements To detect the reachability of a static route's nexthop through a Track entry, you need to create a Track first. For detailed Track configuration procedure, refer to Track Configuration in the System Volume. 1-4

6 Configuration procedure Follow these steps to detect the reachability of a static route's nexthop through Track: To do Use the command Remarks Enter system view system-view Associate the static route with a track entry ip route-static dest-address { mask mask-length } { next-hop-address vpn-instance d-vpn-instance-name next-hop-address } track track-entry-number [ preference preference-value ] [ tag tag-value ] [ description description-text ] ip route-static vpn-instance s-vpn-instance-name&<1-6> dest-address { mask mask-length } { next-hop-address track track-entry-number [ public ] vpn-instance d-vpn-instance-name next-hop-address track track-entry-number } [ preference preference-value ] [ tag tag-value ] [ description description-text ] Required Not configured by default To configure this feature for an existing static route, simply associate the static route with a track entry. For a non-existent static route, configure it and associate it with a Track entry. If the track module uses NQA to detect the reachability of the private network static route's nexthop, the VPN instance number of the static route's nexthop must be identical to that configured in the NQA test group. If a static route needs route recursion, the associated track entry must monitor the nexthop of the recursive route instead of that of the static route; otherwise, a valid route may be mistakenly considered invalid. Displaying and Maintaining Static Routes To do Use the command Remarks Display the current configuration information Display the brief information of the IP routing table Display the detailed information of the IP routing table View information of static routes Delete all the static routes display current-configuration display ip routing-table display ip routing-table verbose display ip routing-table protocol static [ inactive verbose ] delete [ vpn-instance vpn-instance-name ] static-routes all Available in any view Available In system view 1-5

7 The VPN instance support in the delete [ vpn-instance vpn-instance-name ] static-routes all command varies by device. Static Route Configuration Example Basic Static Route Configuration Example Network requirements The IP addresses and masks of the switches and hosts are shown in the following figure. Static routes are required for interconnection between any two hosts. Figure 1-1 Network diagram for static route configuration Configuration procedure 1) Configuring IP addresses for interfaces (omitted) 2) Configuring static routes # Configure a default route on Switch A. <SwitchA> system-view [SwitchA] ip route-static # Configure two static routes on Switch B. <SwitchB> system-view [SwitchB] ip route-static [SwitchB] ip route-static # Configure a default route on Switch C <SwitchC> system-view [SwitchC] ip route-static ) Configure the hosts. The default gateways for the three hosts A, B and C are , and respectively. The configuration procedure is omitted. 1-6

8 4) Display the configuration. # Display the IP routing table of Switch A. [SwitchA] display ip routing-table Routing Tables: Public Destinations : 7 Routes : 7 Destination/Mask Proto Pre Cost NextHop Interface /0 Static Vlan /24 Direct Vlan /32 Direct InLoop /30 Direct Vlan /32 Direct InLoop /8 Direct InLoop /32 Direct InLoop0 # Display the IP routing table of Switch B. [SwitchB] display ip routing-table Routing Tables: Public Destinations : 10 Routes : 10 Destination/Mask Proto Pre Cost NextHop Interface /24 Static Vlan /24 Static Vlan /30 Direct Vlan /32 Direct InLoop /30 Direct Vlan /32 Direct InLoop /8 Direct InLoop /32 Direct InLoop /24 Direct Vlan /32 Direct InLoop0 # Use the ping command on Host B to check reachability to Host A, assuming Windows XP runs on the two hosts. C:\Documents and Settings\Administrator>ping Pinging with 32 bytes of data: Reply from : bytes=32 time=1ms TTL=255 Reply from : bytes=32 time=1ms TTL=255 Reply from : bytes=32 time=1ms TTL=255 Reply from : bytes=32 time=1ms TTL=255 Ping statistics for : Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: 1-7

9 Minimum = 1ms, Maximum = 1ms, Average = 1ms # Use the tracert command on Host B to check reachability to Host A. [HostB] tracert Tracing route to over a maximum of 30 hops 1 <1 ms <1 ms <1 ms <1 ms <1 ms <1 ms ms <1 ms <1 ms Trace complete. 1-8

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