[c-nsp] spanning-tree for local switching on ASR920

[Nick Cutting]

Thank you

In the output of show spanning tree - is the port with the untagged service instance forwarding on vlan 4093?
Unless something changed from 16.6 -> 16.7 I imagine that it is only forwarding and processing BPDU's on vlans 2 and 10.

If a bridging loop came in on Vlan 4093, because BPDU's were not processed on this VLan it may be bad.
 
NIck
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Thursday, March 15, 2018 7:06 AM
To: Nick Cutting <ncutting at edgetg.com>
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] spanning-tree for local switching on ASR920

This message originates from outside of your organisation.

For what it's worth I have working Rapid PVST+ on ARS 920 IOS 16.7.1 with the following configuration:

spanning-tree mode rapid-pvst
spanning-tree vlan 2,10,2302 priority 24576 !
interface TenGigabitEthernet0/0/25
 description => Towards HP 5700FF
 mtu 9216
 no ip address
 load-interval 30
 service instance 1 ethernet
  encapsulation untagged
  l2protocol peer cdp stp lldp
  bridge-domain 4093
 !
 service instance trunk 25 ethernet
  encapsulation dot1q 2,10
  rewrite ingress tag pop 1 symmetric
  bridge-domain from-encapsulation
 !
!
interface TenGigabitEthernet0/0/26
 description => Towards neighbor ASR 920  mtu 9216  no ip address  service instance 1 ethernet
  encapsulation untagged
  l2protocol peer cdp stp lldp
  bridge-domain 4094
 !
 service instance trunk 26 ethernet
  encapsulation dot1q 2,10,2302
  rewrite ingress tag pop 1 symmetric
  bridge-domain from-encapsulation
 !
!

This is of course not directly related to your question about untagged ports. I don't have setup where I can test that right now. But at least the ASR 920 seems to support RPVST fine in IOS 16.7.

--
Peter

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