Let's look at the alternatives in detail. Comments below
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
cisco cabanaboy
Sent: Saturday, June 03, 2000 8:47 PM
To: [EMAIL PROTECTED]
Subject: full meshed ip unnumbered network
here is the design:
ETHERNET
|
1XXX
XXXX
/ \
/ \
2XXX 3XXX
XXXX-----XXXX
/ \
ETHERNET ETHERNET
the three routers are seperated by point to point wan
links, my questions involve the pros/cons of
addressing the wan links using various techniques.
1. make each p2p link its own /30 network
CL: no problem. Common solution
2. make all p2p links use addresses out of the same
pool (i.e. 10.0.0.1, .2, .3, .4, .5, .6)
CL: with point to point links this would be difficult to achieve. You would
have one link per serial interface. Essentially, you would have to give each
interface a 32 bit mask, meaning that in effect all the serial ports would
be on different networks as far as the routing table is concerned.
If, on the other hand, you had a frame relay partial mesh ( hub and spoke ),
this would indeed be one way of doing things. Each pvc would be associated
with a single IP, all of which could be on the same network. If you had a
frame relay full mesh, with two pvc's per site, and you are not using
subinterfaces, then you should be able to do this. I won't state that
emphatically, because I have never tested this, instead choosing to go the
subinterface route in a full mesh. ( I worked in small companies. What can I
say? )
2. ip unnumbered e0
CL: another common way of doing things. Very clean, and saves on IP
addresses.
i think that solutions 2 & 3 would cause problems if
one link came down, because only a portion of the
subnet is down.... if you were doing per packet load
balanceing, then every other packet would drop...
CL: except that if a link is down, your routing protocol should discover
that, and send all packets out the only good interface. You are using
something other than RIP, are you not? :->
as a variation, you colud take the link down between
routers 2 & 3, and make the other p2p's frame relay
links, then have a logical full mesh using pvc's...
CL: cheaper, but be aware of the issues with frame relay.
Comments please..
=====
ciscocabanaboy, CCNP-Voice, CCDP, MCSE, CNX, A+, N+, I-net+, BOFH...
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