Configuration Guide

Table Of Contents
20.1.25Fabric Extend Configuration
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October 2021
138
Fabric Extend Configuration in VRF
config terminal
router isis
ip-tunnel-source-address <tunnel IP source address> vrf <vrf name> ##see note below
exit
logical-intf isis <1-255> dest-ip <ISIS logical interface destination IP> name <word>
isis
isis spbm <1-100>
isis spbm 1 l1-metric <1-16777215; optional if you wish to set the metric>
isis enable
exit
Please note that the IP Tunnel Source Address must either be a brouter or a loopback address.
Fabric Extend Configuration in GRT
When the tunnel source address interface is configured in the GRT, a route-map must be created to match
all the IP addresses used for the tunnel, i.e. any loopback, brouter, or VLAN addresses used for the tunnel
and WAN addressing. This is important to prevent these networks from being advertised by the switch into
ISIS for example when direct interface redistribution is enabled. For this reason, it is recommended to use
the VRF method.
config terminal
router isis
ip-tunnel-source-address <tunnel IP source address> ##see note below
exit
logical-intf isis <1-255> dest-ip <ISIS logical interface destination IP> name <word>
isis
isis spbm <1-100>
isis spbm 1 l1-metric <1-16777215; optional if you wish to set the metric>
isis enable
exit
Please note that the IP Tunnel Source Address must either be a brouter or a loopback address.
Fabric Extend Configuration in VID Tunneling
VID tunneling is supported over either a port or MLT using the configuration shown below. Please note
that two VLAN Id’s are required, one for each B-VLAN where the primary VID must be provisioned the
same at both ends.
logical-intf isis <1-255> vid <vid 1,vid 2> primary <vid 1> port <slot|port>
logical-intf isis <1-255> vid <vid 1,vid 2> primary <vid 1> mlt <1-512>