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22 February 2016

Cisco 4000 series ISR Base UCS-E Configuration

by deaves

I have been replacing a lot of older Cisco ISR routers with 4000 series ISR’s lately. One of the more common things I have seen companies order with the new 4000 series routers are UCS-E blades; especially for smaller sites that don’t any servers. Unfortunately IOS-XE is still relatively new and it can be difficult to find proper configuration guides or working configs. As a result I have seen a lot of bad setups where engineers do not use the internal EVC link for UCS-E connectivity. Instead they cable the UCS-E external ports directly back into the router or cable it directly to the LAN switch. While this works, they are essentially running it as it was a separate device on the network and not part of the router. In this post I will provide a base UCS-E configuration to get people quickly up and running.


Example IP allocation:

When push comes to shove its best to view/treat the BDI interface, that’s tied to the ucse1/0/1 service instance, no different than a SVI on a L3 switch.

ucse subslot 1/0
 imc access-port shared-lom console
 imc ip address default-gateway
interface ucse1/0/0
 description *** UCS - Internal L3 Management ( ***
 ip address
 negotiation auto
 switchport mode trunk
interface ucse1/0/1
 description *** UCS - Internal L2 Interface ***
 no ip address
 negotiation auto
 switchport mode trunk
 service instance 1 ethernet
  description *** Server Vlan EVC ***
  encapsulation dot1q 1
  bridge-domain 1
interface BDI1
 description Server Vlan (
 ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 encapsulation dot1Q 1

For further reading on EVC’s the following blog post is really good:

tags: cisco - ISR4331 - ucs - UCS-E140S-M2 - ucse