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Enable SRTE for ISIS

John Patrick Lopez
Enthusiast
Enthusiast

Quick question guys. For exam and real world use purposes. What is the more acceptable way to enable SRTE for ISIS?

There are two options I have been testing and both of them seem to enable SRTE. Thanks!

Option 1:

router isis SP
address-family ipv4 unicast
router-id loopback0


Option 2:

router isis SP
address-family ipv4 unicast
mpls traffic-eng level-2
mpls traffic-eng router-id loopback0

1 Accepted Solution

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Hi @John Patrick Lopez ,

Option 2 came from the RSVP-TE configuration and was initially required to configure SRTE. Option 1 is the preferred way to configure SRTE in more recent IOS-XR versions, as per the configuration guide.

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-1/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-71x/b-segment-routing-cg-asr9000-71x_chapter_0101.html

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

2 Replies 2

Harold Ritter
Cisco Employee
Cisco Employee

Hi @John Patrick Lopez ,

Option 2 came from the RSVP-TE configuration and was initially required to configure SRTE. Option 1 is the preferred way to configure SRTE in more recent IOS-XR versions, as per the configuration guide.

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-1/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-71x/b-segment-routing-cg-asr9000-71x_chapter_0101.html

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Thank you. I actually tested this months ago and if I remember it right, when I used OSPF as the IGP the SRTE policy went up right away and I didn't even define router-id. I also didn't try to configure the mpls te configurations under the routing process because I also knew it is for mpls-te/rsvp-te. I also didn't see option 1 in any of Clarence's SR book/documentation so I really wondered why putting mpls-te configs under the routing process also enables SRTE.

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