H3C Technologies H3C SR8800 - Manual (Page 202)

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Figure 68 Network diagram
Configuration procedure
1. Configure IP addresses for the interfaces on each router and configure IS-IS:
Follow
Figure 68 to configure the IP address and subnet mask of each interface on the routers.
(Details not shown)
Configure IS-IS on the routers, ensuring that Router A, Router D, and Router S can communicate
with each other at Layer 3. (Details not shown)
2. Configure IS-IS FRR:
You can enable IS-IS FRR to either automatically calculate a backup next hop, or to designate a
backup next hop by using a routing policy.
{
Method I
Enable IS-IS FRR to automatically calculate a backup next hop.
# Configure Router S.
system-view
[RouterS] bfd echo-source-ip 1.1.1.1
[RouterS] isis 1
[RouterS-isis-1] fast-reroute auto
[RouterS-isis-1] quit
# Configure Router D.
system-view
[RouterD] bfd echo-source-ip 4.4.4.4
[RouterD] isis 1
[RouterD-isis-1] fast-reroute auto
[RouterD-isis-1] quit
{
Method II
Enable IS-IS FRR to designate a backup next hop by using a routing policy.
# Configure Router S.
system-view
[RouterS] bfd echo-source-ip 1.1.1.1
[RouterS] ip ip-prefix abc index 10 permit 4.4.4.4 32
[RouterS] route-policy frr permit node 10
[RouterS-route-policy] if-match ip-prefix abc
[RouterS-route-policy] apply fast-reroute backup-interface GigabitEthernet 3/1/1
backup-nexthop 12.12.12.2
[RouterS-route-policy] quit
[RouterS] isis 1
[RouterS-isis-1] fast-reroute route-policy frr