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ME60 V800R010C10SPC500 Configuration Guide - IP Routing 01

This is ME60 V800R010C10SPC500 Configuration Guide - IP Routing
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Configuring IPv6 IS-IS Auto FRR

Configuring IPv6 IS-IS Auto FRR

With IPv6 IS-IS Auto FRR, traffic on a faulty link can be quickly switched to an alternate link, which minimizes traffic interruption and improves IS-IS network reliability.

Usage Scenario

Single-source routing scenario

As networks develop, voice over IP (VoIP) and online video services pose increasingly higher requirements for real-time transmission. Nevertheless, if an IS-IS fault occurs, multiple operations, including fault detection, LSP updating, LSP flooding, route calculation, and forward information base (FIB) entry delivery, must be performed to switch traffic to a new link. These operations take a long time, much longer than 50 ms, the minimum delay to which users are sensitive. As a result, user experience is affected.

With IPv6 IS-IS Auto FRR, devices can rapidly switch traffic from a faulty link to an alternate one without interrupting the traffic, which significantly improves IS-IS network reliability.

IPv6 IS-IS Auto FRR is applicable to the services that are sensitive to packet delay and packet loss.

NOTE:

IPv6 IS-IS Auto FRR can only take effect in the standard topology.

In Figure 9-10, the link cost satisfies the traffic protection inequality: Distance_opt (B, D) < Distance_opt (B, A) + Distance_opt (A, D), in which Distance_opt (X, Y) specifies the shortest distance from node X to node Y. After IPv6 IS-IS Auto FRR is configured, if the link between Device A and Device C fails, traffic forwarded by Device A is rapidly switched to the alternate link.
Figure 9-10 Networking with IPv6 IS-IS Auto FRR

Multi-source routing scenario

IPv6 IS-IS LFA FRR uses the SPF algorithm to calculate the shortest path to the destination node, with each neighbor that provides a backup link as the root node. The backup next hop is node-based, which applies to single-source routing scenarios. With the diversification of networks, multi-source routing scenarios appear, where multiple nodes advertise the same route. Such multi-source routing scenarios do not meet single-source LFA conditions. As a result, the backup next hop cannot be calculated. IPv6 IS-IS FRR for multi-source routing scenarios can address this problem by using a routing source to protect the primary routing source and improve network reliability.

Figure 9-11 Networking with IPv6 IS-IS FRR in a multi-source routing scenario

In Figure 9-11 (a), the cost of the link between Device A and Device B is 5, whereas the cost of the link between Device A and Device C is 10. Both Device B and Device C advertise the route 2001:DB8:1::1/128. IPv6 IS-IS FRR is enabled on Device A. However, single-source LFA conditions are not met. As a result, Device A fails to calculate the backup next hop of the route 2001:DB8:1::1/128. IPv6 IS-IS FRR for multi-source routing scenarios can address this problem.

In Figure 9-11 (b), a virtual node is simulated between Device B and Device C and is connected to Device B and Device C. The cost of the link from Device B or Device C to the virtual node is 0, whereas the cost of the link from the virtual node to Device B or Device C is the maximum value. After the virtual node advertises the route 2001:DB8:1::1/128, Device A uses the LFA algorithm to calculate the backup next hop of the virtual node. Then the route 2001:DB8:1::1/128 inherits the backup next hop from the virtual node. In this example, the primary link to the virtual node is the one from Device A to Device B, and the backup link is the one from Device A to Device C.

Pre-configuration Tasks

Before configuring IPv6 IS-IS Auto FRR, complete the following tasks:

  • Configure the link layer protocol on interfaces.

  • Configure IP addresses for interfaces and ensure that neighboring devices are reachable at the network layer.

  • Configure basic IPv6 IS-IS functions.

  • Configure a local LDP session on the source node, the PQ node, and the nodes between them if remote LFA FRR is required.

Procedure

  • Configure the LFA algorithm.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS process is enabled, and the IS-IS view is displayed.

    3. Run ipv6 frr

      The IS-IS IPv6 FRR view is displayed.

    4. Run loop-free-alternate [ level-1 | level-2 | level-1-2 ]

      LFA is enabled for IPv6 IS-IS Auto FRR.

      If no IS-IS level is specified, LFA is enabled for both Level-1 and Level-2 IPv6 IS-IS Auto FRR.

    5. (Optional) Run frr-policy route route-policy route-policy-name

      A route-policy is configured to filter IS-IS alternate routes.

    6. Run commit

      The configuration is committed.

  • Configure the remote LFA algorithm.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS process is enabled, and the IS-IS view is displayed.

    3. Run frr

      The IS-IS FRR view is displayed.

    4. Run remote-lfa tunnel ldp [ maximum-reachable-cost cost-value ] [ level-1 | level-2 | level-1-2 ]

      Remote LFA Auto FRR is enabled.

    5. Run quit

      The previous view is displayed.

    6. Run ipv6 frr

      The IS-IS IPv6 FRR view is displayed.

    7. (Optional) Run remote-lfa tunnel ldp over-ipv4 [ level-1 | level-2 | level-1-2 ]

      Remote LFA Auto FRR is enabled.

      LFA FRR cannot calculate backup paths on some large IPv6 networks, especially on ring networks, which fails to meet reliability requirements. IPv6 IS-IS remote LFA FRR can address this problem. To enable IPv6 IS-IS remote LFA, run the remote-lfa command. The remote LFA algorithm calculates the PQ node based on the protection path and establishes a tunnel between the source node and the PQ node for backup next hop protection. If a fault occurs on the protection path, traffic is automatically switched to the backup tunnel, improving network reliability.

    8. Run commit

      The configuration is committed.

Checking the Configurations

After configuring IPv6 IS-IS Auto FRR, check the configurations.

  • Run the display isis route [ level-1 | level-2 ] [ process-id | vpn-instance vpn-instance-name ] ipv6 [ ipv6-address [ prefix-length ] ] [ verbose ] command to check information about the primary and alternate links after IPv6 IS-IS Auto FRR is enabled.

Run the display isis route to view information about the outbound interface and next hop of the alternate route.

<HUAWEI> display isis route ipv6 verbose
                        ISIS(1) Level-1 Forwarding Table
                        --------------------------------
 IPV6 Dest  : 2::2/128                       Cost : 0            Flags: D/-/L/-
 Admin Tag  : -                         Src Count : 1         Priority: -
 NextHop    :                           Interface :         ExitIndex :
    Direct                                  Loop1               0x00000000
 IPV6 Dest  : 3::/64                         Cost : 10           Flags: A/-/L/-
 Admin Tag  : -                         Src Count : 1         Priority: Low
 NextHop    :                           Interface :         ExitIndex :   
  FE80::38BA:3600:15AA:BA03               GE2/0/0            0x00000015
 (B)FE80::38BA:3600:15AA:BA03               GE2/0/0            0x00000015

 IPV6 Dest  : 1::1/128                       Cost : 10           Flags: A/-/L/-
 Admin Tag  : -                         Src Count : 1         Priority: Medium
 NextHop    :                           Interface :         ExitIndex : 
  FE80::2200:10FF:FE03:0                  GE1/0/0            0x00000009

 IPV6 Dest  : 6::/64                         Cost : 20           Flags: A/-/L/-
 Admin Tag  : -                         Src Count : 1         Priority: Low
 NextHop    :                           Interface :         ExitIndex : 
  FE80::2200:10FF:FE03:0                  GE1/0/0            0x00000009
   Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,      
       U-Up/Down Bit Set, LP-Local Prefix-Sid
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Updated: 2019-01-04

Document ID: EDOC1100059437

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