I actually just got this kind of working, but had to use MST.
Cisco IOS XE Software, Version 03.18.00.SP.156-2.SP-ext
I'm going to introduce a L2 loop if I can.
This is the primary Internet Facing ASR920, and the southbound switching
configuration, and the client gateway BDI.
interface TenGigabitEthernet0/0/15
description Trunk to ASR-920-02
no ip address
cdp enable
service instance trunk 1 ethernet
encapsulation dot1q 900,901
rewrite ingress tag pop 1 symmetric
l2protocol peer cdp stp
bridge-domain from-encapsulation
interface GigabitEthernet0/0/0
description to downstream client Firewall
no ip address
negotiation auto
service instance 900 ethernet
encapsulation untagged
bridge-domain 900
interface BDI900
ip address xx.xx.xx.2 255.255.255.0
standby 1 ip xx.xx.xx.1
standby 1 priority 105
I can ping across the service instance trunk between the BDI's - but I cannot
get normal STP to start an instance.
sh spanning-tree
No spanning tree instance exists.
What is strange is that only mst is listed as a supported mode.
#spanning-tree mode ?
mst Multiple spanning tree mode
Once changing to MST - my instance works !
(config)#spanning-tree mode mst
#sh spanning-tree
MST0
Spanning tree enabled protocol mstp
Root ID Priority 0
Address 00be.7515.7dbd
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 0 (priority 0 sys-id-ext 0)
Address 00be.7515.7dbd
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te0/0/15 Desg FWD 2000 128.22 P2p
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Mark
Tinka
Sent: Monday, March 12, 2018 5:04 PM
To: Nick Cutting <ncutt...@edgetg.com>; Gert Doering <g...@greenie.muc.de>;
cisco-nsp@puck.nether.net
Subject: Re: [c-nsp] spanning-tree for local switching on ASR920
This message originates from outside of your organisation.
On 12/Mar/18 22:21, Nick Cutting wrote:
> Sorry to drag this one up - Gert did you ever get a working config for this?
>
> I plan on using a pair of 920's with a layer 2 broadcast domain on the 12
> gigabit Ethernet ports, and using the 10g ports to connect to separate
> carriers, bust also use 1 10g port to carry the HSRP for the /24 customer
> address space.
> The 1 gig ports will all need to be in the customer's /24 that they will
> advertise to the independent carriers, I would like run STP in case of a
> cabling error, but the routers are entirely owned by them, in their data
> center, and only to be used for ipv4 BGP internet services and a default
> route from each carrier.
>
> Usually we set this up with a pair of routers and 2 switches - in this
> case I need to do it all on a ASR-920-12SZ-IM (cheap 10g router) Is this
> possible?
The ASR920 has not generally supported STP.
I think since 16.6(1), PVST+/RPVST+ is now supported.
I'd be naturally inclined to use BD's to solve this, but you should test this
with the relevant code and let us know if it works.
Mark.
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