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R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

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ISIS(1) IPv4 Level-1 Forwarding Table
-------------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
14.14.14.0/24 10 NULL GE2/1/1 Direct D/L/-
44.44.44.44/32 10 NULL Loop0 Direct D/-/-
12.12.12.0/32 10 NULL GE2/1/1 14.14.14.4 R/L/-
22.22.22.22/32 10 NULL GE2/1/1 14.14.14.4 R/L/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
14.14.14.0/24 10 NULL GE2/1/1 Direct D/L/-
44.44.44.44/32 10 NULL Loop0 Direct D/-/-
12.12.12.0/32 10 NULL
22.22.22.22/32 10 NULL
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
The output shows that the neighbor relationships and routing information on Router A and Router
B have not changed, which means the neighbors cannot sense the switchover on Router S.
IS-IS FRR configuration example
Network requirements
Router S, Router A, and Router D belong to the same IS-IS routing domain, as illustrated in Figure 55.
Configure IS-IS FRR so that when the link between Router S and Router D fails, traffic is switched to Link
B immediately.
Figure 55 Network diagram
Configuration procedure
1. Configure IP addresses for the interfaces on each router and configure IS-IS.