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Community Member

Service instance configuration

Hello,

I'm need help with following configuration, but can't figure it out myself:

Existing config:

int te0/1
service instance 44 ethernet
  encapsulation dot1q 231,431,731
  l2protocol forward cdp stp
  bridge-domain 44
  
service instance 58 ethernet
  encapsulation dot1q 246,446,746,2806
  l2protocol forward cdp stp
  bridge-domain 58
 
 
int te0/2 
service instance 44 ethernet
  encapsulation dot1q 1429 <- S-Vlan. Can't be changed.
  rewrite ingress tag pop 1 symmetric
  l2protocol forward cdp stp
  bridge-domain 44
 
 service instance 58 ethernet
  encapsulation dot1q 1445 <- S-Vlan. Can't be changed.
  rewrite ingress tag pop 1 symmetric
  l2protocol forward cdp stp
  bridge-domain 58

I'm need to add vlan 2806 to both sites.

Many thanks.

CCNP
5 REPLIES
Cisco Employee

 Please go through below link

 

Please go through below link, having nice explanation about EVC. If any doubt, please let us know.

 

https://supportforums.cisco.com/docs/DOC-21299

 

Regards,

Akash

Community Member

Hi Akash,I'm really don't

Hi Akash,

I'm really don't understand how to brifge it. I'm tried this config, but it not working.

service instance 1458 ethernet
  encapsulation dot1q 231,431,731,246,446,746,2806
  l2protocol forward cdp stp
  bridge-domain 58
 
service instance 44 ethernet
  encapsulation dot1q 1429
  rewrite ingress tag pop 1 symmetric
  l2protocol forward cdp stp
  bridge-domain 58
 
 service instance 58 ethernet
  encapsulation dot1q 1445
  rewrite ingress tag pop 1 symmetric
  l2protocol forward cdp stp
  bridge-domain 58

 

Also, i'm unable to use xconnect on this 3700 switch.

CCNP
Cisco Employee

may be image does not support

may be image does not support mpls. Is LDP up and and running on that switch.

 

To add vlan 2806 you can configure

 

service instance 2806 ethernet
  encapsulation dot1q 2806   >>>>> based on this tagged traffic with vlan 2806 will be processed by this service instance
  rewrite ingress tag pop 1 symmetric >>> will pop tag while receiving traffic and add vlan tag while sending out
  l2protocol forward cdp stp
  bridge-domain 58  >>>> making it part of bridge-domain 58

 

Regards,

Akash

Community Member

Thank you, Akash,It is not

Thank you, Akash,

It is not 3700, but 3560 switch. I think this model do not support xconnect at all.

I'm understand this part of config, bu hou you make it part of domain 44 also?

It is impossible to create one more instance with the same vlan 2806 to bridge it with domain 44.

 

Regards

CCNP
Cisco Employee

 What could be requirement of

 

What could be requirement of making one vlan part of two bridge-domain? You can make two vlan part of same bridge-domain but not one vlan part of two bridge-domain.

Can you do this with traditional switching (access port and trunk port)?

 

Regards,

Akash

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