Vxlan ASR1001-x | Dual Router Architecture at both HUB & Branch

[bradley.gubbels]

Hello, 

Currently implementing vxlan (unicast) on 4 x Cisco ASR1001-x 16.6.x (IOS-XE).   The end goal is to have redundant routers at both location for a single vlan (4).  When there is just two routers - no issues. However, when the secondary routers are added to the vni, we experience spanning-tree events.  OTV has been used to in the past to accomplish this (built in spanning-tree mechanism), however it seems VXLAN is different. 

Any thoughts or Suggestions would be appreciated. 

                        Architecture:

HUB Router 1  <--vlan 4-->  Branch Router 01

Same Location                         Same Location

HUB Router 2  <--vlan 4-->  Branch Router 02

[balaji.bandi]

Do you have spanning tree enabled? What does the port config look like?

[bradley.gubbels]

There is a separate spanning-tree instance running on the HUB side and Branch Side (MST).  

Both the Hub side and Branch side are the same. 

HUB Side - Core interface to ASR-1  (ASR2 is similar configuration with Po)

* L2 interface in Port channel to ASR

description ASR1001X-VXLAN-1 Gi0/0/4
switchport
switchport trunk native vlan 999
switchport mode trunk
switchport trunk allowed vlan 4
channel-group 96 mode active

HUB - ASR-1 Interface to Core (ASR-2 similar configuration with separate Po)

!

interface Port-channel12
description to Po97 
mtu 9000
no ip address
no negotiation auto
service instance 4 ethernet
encapsulation dot1q 4
rewrite ingress tag pop 1 symmetric