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Best practice to connect 2 pvst+ clouds via a WAN

Unanswered Question
Feb 4th, 2006
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My company need to interconnect 2 Sites both configured with multiple vlans. Each vlan on a site has a matching vlan in the other site (same subnetwork). We have already purchased a LL of 2 Mbps with X21/V11 interface between the 2 sites and I need to configure both routers that interconnect the 2 sites in such a way that :

- the WAN link behave like a LAN extension, in such a way that for example a flooding of arp broadcasts on a vlan would extend to the other site.

- there are a couple of vlans in one site that need to be translated with a different vlan-id in the other site, in such a way that for example a flooding of arp broadcasts in vlan 2 in Site 1 would flood in vlan 3 in Site 2.


I suggest the following suggestion, but can't do any test before the delivery of the line and the routers :

- Both routers interconnecting the 2 sites could be configured with as many 802.1Q subinterfaces as vlan-ids on the LAN side and as many tunnel virtual interfaces as vlan-ids on the WAN side. Then, configure bridging between each subinterface and tunnel interface using "bridge" command.


Is this solution acceptable, or is there a better practise (assuming that the LL is already purchased and cannot be replaced by an ethernet solution).


Thanks for your help

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pkhatri Sat, 02/04/2006 - 03:30
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Hi Jerome,


In the absence of an ethernet solution, your options are very limited. What you have proposed should work okay. However, you will need to be careful of the amount of inter-site traffic and the contention for WAN bandwidth between different VLANs. I would consider the use of a QoS service-policy on the WAN interfaces at each site in order to ensure a fair allocation of bandwidth between the VLANs...


Hope that helps - pls rate the post if it does.

Paresh

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