[c-nsp] Dial-Backup / OSPF

[Vitkovsky, Adam]

Just enable the "ip ospf demand-circuit" cmd under the dial backup interfaces

The LSAs are than exchanged only once with DNA bit set, periodic refresh (30 min by default) is suppressed and LSAs are sent only when there's topology change -therefore the remote site should be conf at least as stub (to minimize the impact of topology changes)
Also periodic hellos are suppressed
-though the adj remains up even when the dial interface goes down/up(spoofing)
 
Search for ospf demand circuit feature

adam

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Paul Stewart
Sent: Wednesday, February 22, 2012 6:33 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Dial-Backup / OSPF

Hey folks.

 

Looking for some pointers (docs are fine too). We have a customer that has
multiple locations fed by fiber or other dedicated connectivity.  At each
location we will be also installing an analog phone line for dial-backup
purposes. Each remote location also communicates back to our network via
OSPF today.

 

The remote site configuration (Juniper) we have figured out, but what we're
trying to get our head around is the dial-up coming in.  We would be
terminating the dial-up connections on a Cisco AS5400XM box.  Each inbound
user session would have a static IP address assigned (/32) and we are
looking for a way to establish OSPF sessions to each of those /32 addresses?

 

Thanks,

 

Paul

 

 

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