[c-nsp] MTU - issue while doing VPLS over VPLS!

[Dipesh Basnet]

I have requirement of GRE over VPLS ? 

 

20 remote sites routers connect to one central cisco router.

 

Remote router : 3 WAN interface ,  100 kpps throughput , MPLS / VPLS /GRE
over VPLS

 

Central router : 4 WAN interface , 600-900 kpps throughput , MPLS / VPLS
/GRE over VPLS

 

Regards,

Dipesh Basnet

From: Dipesh Basnet [mailto:dipesh.basnyat at gmail.com] 
Sent: Tuesday, August 02, 2011 3:39 PM
To: 'cisco-nsp at puck.nether.net'
Subject: MTU - issue while doing VPLS over VPLS!

 

Dear Sir ,

 

we are deploying Cisco metro Switch to create VPLS network as below.

 

PC-----Cisco Switch + Cisco switch ------------E1 Link [ service provider]
---------Cisco Switch + Cisco Switch -----internet 

 

For E1 link , we are using protocol converter that its Ethernet port only
support MTU 1500. That means we have MTU 1500 for backhaul link.

 

Now when we do VPLS or  VPLS over VPLS ,  There are some application not
working properly. 

 

I want to know ,  does Cisco Switch fragment the packet at its outer
interface of the switch that is connect to E1 link. Or shall we ask Service
provider to increase the MTU [ or place protocol converter that support
higher MTU]

 

 

 

Appreciate if you could help me with proper solution.

 

Dipesh Basnet