R: RE: [Bulk] [Xorp-users] Question about ospf protocol implementation on XORP

Tue, 15 Nov 2005 09:12:31 +0100 (GMT+01:00)

Thanks mike it would be great to have some working lab configs just to 
help me getting use with ospf implementation on xorp.
I am handling my 
thesis on xorp and i specially need to handle ospf protocol so 
everything can help me it's welcome.
Thanks
Andrea

----Messaggio 
originale----
Da: caddisconsulting@yahoo.com
Data: 13-nov-2005 1.44 AM
A: <riccardo.sciaccaluga@tin.it>, <xorp-users@xorp.org>
Ogg: RE: [Bulk] 
[Xorp-users] Question about ospf protocol implementation on XORP

Hi 
Riccardo,

Very good questions, I think you are mixing a few terms.  
The fact that OSPF
uses the hello process to discover neighbors does 
not make it a link-state
routing protocol (RIP also uses hellos for 
neighbor discovery, but it is a
distance vector routing protocol).  In 
OSPF once a neighbor is discovered
there is a database exchange, this 
is how information about the network
topology is initially propogated, 
not by the hello messages themselves.
What makes OSPF a link-state 
routing protocol is that each router
contributes to the link-state 
database and routing updates are event driven
(change in link state) 
rather than being announce at a fixed interval like
RIP.

You are 
correct that you should be able to configure 2 XORP routers on a
broadcast network, like Ethernet, and have them automatically discover 
each
other.  Right now the OSPF code is pretty new, so it's not too 
surprising if
you are experiencing some issues.  I'll send you some 
working lab configs
next week.

-mike

-----Original Message-----
From: 
xorp-users-admin@xorp.org [mailto:xorp-users-admin@xorp.org] On Behalf
Of riccardo.sciaccaluga@tin.it
Sent: Saturday, November 12, 2005 8:39 
AM
To: xorp-users@xorp.org
Subject: [Bulk] [Xorp-users] Question about 
ospf protocol implementation on
XORP

Hi
I have been reading all the 
exchanged mail about establishing ospf
adiacences but i have a 
question.
Ospf is supposed to be a link state
packet routing protocol; 
this means the protocol is able to build up its
knowledge about the 
network topology by itself with hello packets exchange
so the questiopn 
is:
Why in the config file sample exchanged inside the mail i have been 
looking
at, there is the declaration of the neighbours id(adress) for 
each interface
of the router?
Moreover how
could it be a simple config 
file just to run ospf protocol on routers placed
in a simple network 
topology A<-->B<-->C....i mean how could it be a simple
config file 
that let the router exchanging hello packets and building up the
network topology by themselves?
Thank in advance

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