Configuration recommendations

When configuring GTM, the following recommendations should be considered:

• In a dual-homing configuration, ECMP to the upstream multicast hop (UMH) routers must be configured for the BGP routes to be used. If the UMH routers are unreachable via ECMP, it may cause duplicate traffic in the core. This behavior is consistent with RFC 7716, section 2.3.4., which states that the single forwarder selection (SFS) procedure cannot be applied to GTM.

• For IPv6 GTM, the IPv4 address must be configured as the IPv6 system address, as in the following example.

      *A:Dut-F>config>router#
              interface "system"
                  address 10.20.1.4/32
                  ipv6
                      address ff0e::db8:104/128
                  exit
                  no shutdown
              exit