From: McLaughlin, Jeffery (JMcLaughlin@sfchronicle.com)
Date: Sat Dec 18 2004 - 23:48:26 GMT-3
One common problem with OSPF demand circuits over dialer profiles with PPP
multilink is that the cost changes when one of the B-channels disconnects:
r4#sh ip ro os
O 172.31.2.1 [110/782] via 192.168.45.5, 00:00:20, Dialer1
r4#isdn test disc i b0/0 b1
00:30:204052918340: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down
r4#sh ip ro os
O 172.31.2.1 [110/1563] via 192.168.45.5, 00:00:01, Dialer1
Notice the cost went up when one B-channel went down. Because topology
changes are one of the things that can trigger OSPF demand circuit dialing,
this can keep the link up. Try setting a manual cost on the dialer profile:
r4(config-if)#ip ospf cost 9999
r4#sh ip ro ospf
O 172.31.2.1 [110/10000] via 192.168.45.5, 00:00:07, Dialer1
r4#isdn test disc i b0/0 b1
00:32:173988147268: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down
O 172.31.2.1 [110/10000] via 192.168.45.5, 00:00:52, Dialer1
Now the cost is staying the same...
Jeff McLaughlin
CCIE #14023
-----Original Message-----
From: nobody@groupstudy.com on behalf of Lai, Ben
Sent: Sat 12/18/2004 4:49 PM
To: ccielab@groupstudy.com
Cc:
Subject: Using Dialer Profile as OSPF Demand-circuit
Hi all,
Here's a problem I met when using ISDN Dialer Profile for OSPF
demand-circuit, It was:
There are two router running OSPF with a serial interface and a BRI
interface. Running AREA 0 between Serials and a virtual link area between
BRIs, When I using the Phycisal BRI interface with the Demand-circuit
function, It works well, But when I use the Dialer profile with the PPP
Multilink, the ISDN link keeps up and down. I debug ip ospf hello, there's
no hello packet pass the Dialer OR BRI interface, but the dial reason is
"s="my ip add, d=224.0.0.5". Anybody could tell me why?
Thanks
Ben
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