Problem: simultaneous connection setup

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Feb 9th, 2004
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We have a problem with our Telecommuters which dial-in, using ISDN BRI-line.

See Attachement.

If they come in at R4(standby HSRP), R3 establishes a second (outbound) connection within 2-5 seconds.

Does anybody had a similar problem?

Any hints and tricks are welcome!

Thanks, Alex







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makchitale Wed, 02/11/2004 - 17:25
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Looking at the topology sketch here is what I understand:


1)When a remote 803 calls in to say R4 & connects, the R4 will have a host route (let's assume that the 803 comes with static ip address 1.1.1.1) in the routing table (1.1.1.1/32).

OSPF is supposed to distribute this as an routing update to the remaining routers.

2) In R3, show ip route 1.1.1.1 will show it's learnt via R4 as next hop with an admin value 110.....but in fact when R3 needs to send a packet to 1.1.1.1 it will see the static route with lower admin dist & actually make a call OUT.


Try increasing the admin distance on the static route on the R3:

no ip route 255.255.255.248

ip route 255.255.255.248 200 <===add 200 at the end


Now the point arises is that why did the other routers send packet destined for 1.1.1.1 to R3 instead of R4 (since they should have learnt that thru ospf). It will be interesting to see what the "sh ip route" shows on the remaining routers. Surely SGBP should not cause it, not sure if HSRP is causing it.


Please let me know if increasing the admin value fixes it....


Thanks, Mak.

agis.lan21 Tue, 02/17/2004 - 01:50
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Hi Mak,


I've tested it, but it has no effect.

Have you any other ideas?


Thanks, Alex

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