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Beginner

Migration from 7600 to ASR9k - split horizon groups

Hi,

On 7600 I have a set of service instances. For example:

------------------------

service instance 7583 ethernet

  encapsulation dot1q 2007 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

  bridge-domain 11

!

service instance 420 ethernet

  encapsulation dot1q 2004 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

  bridge-domain 11 split-horizon

!

service instance 7694 ethernet

  encapsulation dot1q 2002 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

  bridge-domain 11 split-horizon

!

int vlan 11

ip vrf forw Test

ip address 1.1.1.1 255.255.255.128

-------------------------

To convert this to IOS-XR - how should I specify split horizon?

Like this?

--------------------------

interface Ten0/1/0/0.7583 l2transport

  encapsulation dot1q 2007 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

!

interface Ten0/1/0/0.420 l2transport

  encapsulation dot1q 2004 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

!

interface Ten0/1/0/0.7694 l2transport

  encapsulation dot1q 2002 second-dot1q 420

  rewrite ingress tag pop 2 symmetric

!

!

interface BVI11

description Test

vrf Test

ipv4 address 1.1.1.1/25

!

l2vpn

bridge group BG-TEST

  bridge-domain BD-TEST-11

interface Ten0/1/0/0.7583

interface Ten0/1/0/0.420

interface Ten0/1/0/0.7694

-------------------------------

Or like this:

-------------------------------

<config omitted>

l2vpn

bridge group BG-TEST

  bridge-domain BD-TEST-11

  interface Ten0/1/0/0.7583

    split-horizon group

  interface Ten0/1/0/0.420

   split-horizon group

  interface Ten0/1/0/0.7694

   split-horizon group

-------------------------------

In short: Do I need to specify "split-horizon group"?

/Jorgen

Everyone's tags (4)
4 REPLIES 4
Cisco Employee

Migration from 7600 to ASR9k - split horizon groups

Jorgen,

your second example is how to go about it.

in your l2vpn configuration and then underneath the bridge-domain section you define your EFPs (l2transport interfaces) and you can take them out of the default split horizon group.

Three SHG groups are defined for VPLS(SHG0,SHG1 and SHG2). By default, all the 
bridge-ports( AC or PW ) come in SHG0. When a Split horizon-group is configured
under the Bridge-port( either under AC or PW) they come in SHG2.
PWs defined under VFI come in SHG1.
By definition, Bridge-ports in same SHG(SHG1 and SHG2) won't talk to each
other ( this is not applicable for SHG0 though ). SHG0 --- > SHG0,SHG1 and SHG2 SHG1 --- > SHG0 and SHG2 SHG2 ----> SHG0 and SHG1

xander

Cisco Employee

Re: Migration from 7600 to ASR9k - split horizon groups

when you have ACs under different SHG (other than 0), don't we expect any traffic (UC/BC/MC) to be forwarded ?

Also, is there any configuration where only BC/MC allowed to forward, but no UC traffic ?

Please clarify

 

Cisco Employee

Re: Migration from 7600 to ASR9k - split horizon groups

BUM traffic (broadcast, unknown unicast, multicast) received from one member of the SHG is never flooded to other members of the same SHG. The behaviour is the same for all three traffic types.

Beginner

Re: Migration from 7600 to ASR9k - split horizon groups

Great. Thanks for fast response!

Sent from Cisco Technical Support iPhone App

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