Configuration

The following configuration on the P2 and P7 routers is required for the Global Weighted SRLG protection scenario explored in this lab:

• The following configuration enables Global Weighted SRLG protection, which considers both local and remote SRLGs when calculating the TI-LFA backup path:

  P2

  router isis IGP
  address-family ipv4 unicast
    fast-reroute per-prefix srlg-protection weighted-global

  The Local SRLG-disjoint protection is already configured on the P2 router.

• The following configuration adds the P7–P3 link to the same SRLG group, SRLG-100, as configured on the P2 router. Furthermore, it advertises the SRLG information as a link attribute in the IS-IS LSPDU. This information is propagated as an Application Specific Link Attribute (ASLA) encoded in TLV 238, as defined in RFC 9479, IS-IS Application-Specific Link Attributes:

  P7

  srlg
  interface GigabitEthernet0/0/0/1
    name SRLG-100
  !
  name SRLG-100
    value 100
  router isis IGP...