Hello,
reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/seg_routing/configuration/xe-17/segrt-xe-17-book/m-isis-multi-domain-prefix-sid-advert.html#reference_o3z_hpb_mmb
I am trying to follow the above example for ISIS multidomain as part of a test for Segment Routing, the above example shows that a loopback 0 has been used in both ISIS processes. This doesn't seem to be allowed on cisco C8000V (VXE) CML.
Note: checked also on XR IOS and that is possible there, it seems to be limitation on XE C8000V. I am open for any suggestions.
Config snipped
/// some outputs has been omitted.
interface Loopback0
description core loopback
ip address 4.4.4.4 255.255.255.255
end
PE2#sh running-config | sec router isis
....
router isis CORE
net 49.0001.0004.0004.0004.00
metric-style wide
segment-routing mpls
fast-reroute per-prefix level-2 all
fast-reroute ti-lfa level-2
passive-interface Loopback0 < - loopback0 already as passive on CORE process, as per the reference link.
router isis CORE2
net 49.0002.0004.0004.0004.00
metric-style wide
segment-routing mpls
fast-reroute per-prefix level-2 all
fast-reroute ti-lfa level-2
PE2#conf t
PE2(config)#router isis CORE2
PE2(config-router)#passive-interface loopback 0
%CLNS: Duplicate system ID configured in ip vrf <default> with router isis CORE
PE2(config-router)#end
PE2#wr
