tag 1000

[Ibrahim Jamil]

Hi Freinds according the below config , which command let me catch the operation of tag 1000 on IOS XR router isis core-agg interface Loopback0 passive point-to-point address-family ipv4 unicast tag 1000

[Giuseppe Larosa]

Hello Ibrahim,

on an OSPF neighbor of this IOS XR device you can use

show route <loopback0-address>

or you can check the isis database for the IS-IS  LSP (Link State PDU) generated by the device with IOS XR

show isis database detail

show isis database detail <LSP-ID>

Hope to help

Giuseppe

[Ibrahim Jamil]

Hello Giuseppe

How to get it via Debug ???

My Network Manager like to see it via Debug

thanks Giuseppe

[Giuseppe Larosa]

Hello Ibrahim,

there is no sense on using a debug command that can have an impact when there are show commands that can provide the required information.

It is just a route tag a show route or show ip route of the loopback prefix is enough to demonstrate on another device, that is an ISIS  neighbor,  that the command is effective (or not).

Edit:

Because in ISIS every info originated by a node has to be present within the LSP (Link State PDU) generated by that node you can use a debug isis to see contents of sent locally generated LSP.

Look for available options under

debug isis  ?

look for options that show the LSP content in update. However, to see the content of LSP you need to wait for LSP refresh that happens every 15 minutes or you need to tear down an ISIS adjacency that is not recommended.

The tag command is supported in IOS XR for local connected interfaces since long time see

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-4/routing/command/reference/b-routing-cr-asr9000-64x/b-routing-cr-asr9000-64x_chapter_0101.html?dtid=osscdc000283#ref_2225942

Hope to help

Giuseppe

[Ibrahim Jamil]

Thanks Giuseppe