RE: 10720 Subinterfaces vs Secondaries

From: SANCHEZ-MONGE,ANTONIO (HP-France,ex2) (antonio.sanchez-monge@hp.com)
Date: Sat Jan 24 2004 - 12:23:07 GMT-3


Hi Nick,

Just a thought:

If you use sub-interfaces you need to use VLAN trunking, which leads you to
configure the VLANs on all the switches. One clear advantage is that you get
the broadcast domains separated and decrease the risk of a network-wide
spanning-tree loop. And you get much more control and less traffic overhead.

If you use secondary addresses, you do not need to do a lot of configuration
but is not scalable. For OSPF it might be OK, but for distance vector
protocols you would have to care about split horizon issues etc...

Cheers,
Ato.

-----Original Message-----
From: nick griffin [mailto:ccie_in04@yahoo.com]
Sent: viernes, 23 de enero de 2004 19:39
To: ccielab@groupstudy.com
Subject: 10720 Su binterfaces vs Secondaries

Hello all,
 
I am looking at setting up sub-interfaces or possibly secondaries so that I
can place muliple networks into my ospf domain to provide routing for a
customer with multiple netblocks. I was wondering if someone could give me
an idea of some of the key advantages or disadvantages of deploying one way
or the other? Thanks in advance.
 
Nick

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