On 22/07/2010, at 8:16 PM, Matthew Melbourne wrote: > Is it possible to extend two vDCs between Data Centres using OTV (pair > of N7k on each site) - it's not clear how OTV uses vDCs to extend the > L2 domain.
yes, its possible. there are 3 methods: 1. OTV runs inside a Virtual Device Context. for 2 VDCs you could run OTV in each of them. this approach requires 'WAN' connectivity to each VDC - perhaps a downside if its not already there. 2. if you don't have overlapping VLANs between the VDCs then you can trunk the VLANs (L2) from one VDC to another using a crossover external cable (1G or 10G or Nx1G/10G depending on your traffic levels), then use a single OTV instance to transport all the VLANs between sites. 3. you could run a single instance of OTV within each VDC (similar to #1) with the 'WAN' IP connectivity to the OTV cloud achieved via a single VDC with a crossover external cable (1G or 10G, doesn't really matter) @ L3 between VDCs to the single VDC that has WAN connectivity (similar to #2). i.e. sort of a hybrid of the above two. > Also, is it correct that Unicast-only transport support (and hence the > use of an Adjacency Server) is not supported initially (looking at the > BRKDCT-2049 Networkers' presentation). correct. > > Alternatively, are there other mechanisms to achieve L2 connectivity > for two separte L2 domains over a pair of redundant links between Data > Centres? quite a few ways of doing it, but OTV does solve some unique problems and issues with the various other approaches. cheers, lincoln. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
