From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Wed Dec 06 2000 - 07:15:38 GMT-3
Hi,
I am having real trouble with these.......
If I have a point-to-point link, and on one side I have dialer map
statements and on the other side I do NOT have dialer map statements (i.e.
dialer string xxxxxx), what I have found:
1. If I leave the network type as POINT_TO_POINT I must include the
broadcast keyword in the dialer map statement, otherwise an adjacency never
forms - this is logical as point-to-point uses multicast.
2. If I include the broadcast keyword in the dialer map statement and have
the dialer interface configured as ip ospf demand-circuit, HELLO's are still
sent over the dialer interface - however NOT while the line is up, only once
it disconnects.
3. Demand-circuit doesn't work if you use NON_BROADCAST or BROADCAST -
Hellos continue to be sent - I thought this might get around using the
broadcast in the dialer map (at least for NON_BROADCAST).
This 'seems' to be a simple technology, but it won't work properly for me!!
Any ideas as to why OSPF multicasts to BRI0 once the line goes down??
I HAVE JUST DONE SOME MORE TESTING AND FOUND THAT THIS BEHAVIOUR ONLY OCCURS
IF YOU ARE REDISTRIBUTING INTO OSPF. ONCE THE LINE GOES DOWN, THE ROUTER
REDISTRIBUTING BRINGS UP THE LINE. THE REASON FOR CALL IS AN OSPF MULTICAST
TO 224.0.0.5. IN THE SCENARIO (BOOTCAMP 17), ONE OF THE ROUTERS IS
REDISTRIBUTING IGRP. THE OTHER END IS REDISTRIBUTING IS-IS AND DOES NOT
BRING UP THE LINE WITH THIS REDISTRIBUTION.
IS THIS NORMAL??
Regards,
Justin Menga MCSE+I CCNP CCSE ASE
WAN Specialist
Computerland New Zealand
PO Box 3631, Auckland
DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
mailto: justin.menga@computerland.co.nz
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