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Going from 3750 to ASR 920

brownjerrid
Level 1
Level 1

Hi All,

My workplace has made the decision to move from the 3750 platform to the ASR platform (they have purchased an ASR 920).  I have never worked with the ASR routers so I'm a bit lost.  We have a few buildings that interconnect with fiber through the 3750, which will be replaced with an ASR 920.

What is the best way to replicate the same vlan and vlan-interface behavior that we currently have set up on our 3750?  I have read up a bit on the 920's and it says a lot about using service instances and BDI's, but I'm not sure how to do it properly.  I have a bit of a lab setup so I am lucky enough to be able to play with the device a bit before we deploy it.  Here's the currently configuration on our 3750 that is at the core of our other switches that I'm wanting to translate onto the ASR 920:

vlan 10
 name Workstations

vlan 20
 name Printers

vlan 30
 name KVM

interface GigabitEthernet1/0/1
description Link to Building 1
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport trunk allowed vlan 10,20,30
switchport mode trunk

interface GigabitEthernet1/0/2
description Link to Building 2
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport trunk allowed vlan 10,20,30
switchport mode trunk

interface GigabitEthernet1/0/3
description Link to Building 3
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport trunk allowed vlan 10,20,30
switchport mode trunk

interface Vlan10
ip address 192.168.10.1 255.255.255.0

interface Vlan20
ip address 192.168.20.1 255.255.255.0

interface Vlan30
ip address 192.168.30.1 255.255.255.0

Any help would be appreciated.

Thanks,

JB

2 Replies 2

Philip D'Ath
VIP Alumni
VIP Alumni

You are using a flat vlan structure across all your buildings. I'm not sure the ASR920 was the best choice.

Yes, you will need to use bridge domains.

Ugur Ersoy
Level 1
Level 1

long time has passed since I used asr9xx, yet it supposed to be like that.

interface GigabitEthernet1/0/1
description Link to Building 1

service-instance 10 ethernet

encapsulation dot1q untagged

bridge-domain 10


service-instance 20 ethernet

encapsulation dot1q vlan 20

bridge-domain 20

service-instance 30 ethernet

encapsulation dot1q vlan 30

bridge-domain 30

int vlan (can be BVI, not really sure) 10

ip addr

int vlan 20

ip addr

int vlan 30

ip add

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