From: Lupi, Guy (Guy.Lupi@xxxxxxxxxxxxx)
Date: Tue Apr 02 2002 - 17:25:01 GMT-3
Make OSPF interesting in your list, on the demand circuit you can do this
because the router will know not to reset the idle timer when the traffic is
OSPF. It also doesn't work right when you have OSPF as not interesting, the
line will not come up with changes to the LSA database. Use "no peer
neighbor-route" to get rid of the PPP host route on each side, and I have
found that it works best if you also increase the OSPF cost on the line
using "ip ospf cost 9999". You only need the demand circuit command on one
side. When all is said and done, the OSPF routes should stay in the table
even when the line is down, assuming there are no routes that are more
preferred due to metric or admin distance, and you should see a neighbor in
the "show ip ospf neighbors" for which there is no dead time. There will be
a dead time initially, but when it expires the neighbor should still show up
in the output. Try those and see how it goes.
~-----Original Message-----
~From: Giveortake@aol.com [mailto:Giveortake@aol.com]
~Sent: Tuesday, April 02, 2002 3:03 PM
~To: ccielab@groupstudy.com
~Subject: OSPF DDR
~
~
~All,
~
~Basically I have a bunch of routers/routes on one side and a bunch of
~routers/routes on the other side of a BRI DDR link. I am
~trying to figure
~out how to make the BRI routers dial only when interesting
~traffic (no OSPF
~updates) is dictated across the link. Then after say 60
~seconds of no
~interesting traffic I want the link to go down but LEAVE THE
~OSPF tables
~intact. I have a hunch the secret lies in the "IP OSPF
~DEMAND CIRCUIT"
~command, but I havent been able to make the tables stay intact on BOTH
~routers. What am I missing??
~
~Thanks,
~
~David
~
~Sample Config:
~
~R2
~
~username R5 password cisco
~
~interface BRI0
~ ip address 150.50.9.2 255.255.255.192
~ no ip directed-broadcast
~ encapsulation ppp
~ no ip route-cache
~ ip ospf message-digest-key 1 md5 cisco
~ ip ospf network point-to-point
~ ip ospf demand-circuit
~ no ip mroute-cache
~ dialer idle-timeout 60
~ dialer map ip 150.50.9.5 name R5 broadcast 5418545
~ dialer-group 1
~ isdn switch-type basic-ni
~ isdn spid1 61678903240101
~ isdn spid2 61678903250101
~ no cdp enable
~ ppp authentication chap
~
~access-list 101 deny ospf any any
~access-list 101 permit ip any any
~dialer-list 1 protocol ip list 101
~
~
~R5
~
~username R2 password cisco
~
~interface BRI0
~ ip address 150.50.9.5 255.255.255.192
~ no ip directed-broadcast
~ encapsulation ppp
~ ip ospf message-digest-key 1 md5 cisco
~ ip ospf network point-to-point
~ ip ospf demand-circuit
~ dialer idle-timeout 60
~ dialer map ip 150.50.9.2 name R2 broadcast 7890324
~ dialer-group 1
~ isdn switch-type basic-ni
~ isdn spid1 61654185450101
~ isdn spid2 61654185460101
~ ppp authentication chap
~
~access-list 101 deny ospf any any
~access-list 101 permit ip any any
~dialer-list 1 protocol ip list 101
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