Cisco ASR 901 Router - Help with Interface IP and more

Jeremy Gibbs · ‎03-26-2019

This router will be used as a type of "router on a stick". The router will have a single interface with an IP of 192.168.1.1 that will be the default gateway, any traffic that needs to go over the MPLS network, will be routed to the MPLS router at 192.168.1.2 and everything else will be routed to 192.168.1.3.

When I went to configure an interface IP, it said setting an IP on the interface isn't supported. I then applied the IP to the VLAN1 interface that exists by default.

If I run a show int status, I see port gig 0/4 in VLAN1.

Can I have my routes like:

ip route 0.0.0.0 0.0.0.0 192.168.1.3
ip route 10.20.30.0 255.255.255.0 192.168.1.2

with port gig 0/4 in VLAN 1, or do I need to set up bridge-domain with EVCs? Because I don't know how to do the bridge-domain with EVCs.

Thanks.

Hector Gustavo Serrano Gutierrez · ‎04-08-2019

These platforms usually required to follow the "EVC with Bridge-Domains" configuration approach. It is not that difficult.

For instance, see the below comparison.

Layer 2 port with SVI (interface vlan)

interface vlan1
 ip address 192.168.1.1 255.255.255.0
 no shutdown
!
interface GigabitEthernet0/4
 swichport                ! Default with certain modules
 switchport mode access   ! Default with certain modules
 switchport access vlan 1 ! Assigned to vlan 1 by default

EVC with Bridge Domain

interface BDI1
 ip address 192.168.1.1 255.255.255.0
 no shutdown
!
interface GigabitEthernet0/4
 service instance 1 ethernet   ! Value "1" is an identifier significant within the physical interface.
  encapsulation dot1q untagged ! "service instance 1" matches when receives an untagged frame, like an Access port.
  bridge-domain 1              ! references the BDI1 interface.

HTH