Summary Route

[gavin.mckee]

Hi,

We use a class B network address with a /25 Mask. We have three sites connected via E3 and 100Mbps Circuits. My question is this:

We have a VPN Tunnel that acts as backup when the primary links in one site fails. I have 12 floating static routes that will kick in when RIPv2 loses the routes to the remote site.

I would like to summarize the routes into a floating static route, however I am worried about discontigous networks here. Auto-Summary is turned off in RIPv2, can I still summarize these routes?

See attached file...

[gpulos]

if your 'discontiguous' networks are not configured anywhere in the network, than a single summary could be used for the 'dub' 172s for example.

this would inevitably bring up problems if one or more of the nonUse subnets was to be put in use else where in the network. may not be your best choice if you plan on expanding and possibly using those subnets.

since you have so few static routes it may be best to just use those instead of a summary here. (the trade off between creating the summaries and maintaining them may be as adminitratively busy as just plain static routes, if not more)

if you did want a summary here is an example for DUB 172s: (this leaves many open subnets not in use; may not be best solution and definately not best practice)

172.22.144.0/28 = .144 -> .153

again, i believe in this case, floating statics will be your best, easiest solution.