From: ying chang (ying_c@xxxxxxxxxxx)
Date: Mon Apr 22 2002 - 10:41:46 GMT-3
Ya,
I did see the problem when I shut the frame relay link with your config. But
we have more than one way to do things, please see below and give it a try
and let me know if it works for you:
r1#sb router ospf
router ospf 100
router-id 192.168.200.1
log-adjacency-changes
redistribute igrp 100 subnets tag 2 route-map igrp-routes
network 133.10.2.1 0.0.0.0 area 0
network 133.10.5.1 0.0.0.0 area 0
network 133.10.6.1 0.0.0.0 area 0
neighbor 133.10.2.4
neighbor 133.10.2.3
default-information originate always route-map check-isdn-route
distance 125 133.10.3.2 0.0.0.0
!
route-map check-isdn-route permit 10
match ip address sub192 <<-- a route can be picked up by isdn
match ip next-hop isdn-link <<-- when frame relay dies
!
ip access-list standard sub192
permit 192.168.1.0 0.0.0.255
!
ip access-list standard isdn-link
permit 133.10.5.5 <<<--- next hop isdn address
!
----------------------------------------
Frame Relay is up and running (192.168.1.0) go through S0.1:
r1#sir
Gateway of last resort is not set
192.168.200.0/32 is subnetted, 1 subnets
C 192.168.200.1 is directly connected, Loopback192
128.200.0.0/24 is subnetted, 1 subnets
C 128.200.1.0 is directly connected, Loopback128
160.100.0.0/16 is variably subnetted, 2 subnets, 2 masks
B 160.100.128.0/22 [200/0] via 133.10.3.2, 01:15:22
I 160.100.0.0/16 [100/8576] via 133.10.3.2, 00:00:01, Serial0.2
O E2 192.190.102.0/24 [110/20] via 133.10.2.3, 00:03:52, Serial0.1
133.10.0.0/16 is variably subnetted, 11 subnets, 3 masks
C 133.10.6.0/24 is directly connected, Serial1
C 133.10.5.0/24 is directly connected, BRI0
C 133.10.3.0/24 is directly connected, Serial0.2
C 133.10.2.0/24 is directly connected, Serial0.1
C 133.10.5.5/32 is directly connected, BRI0
I 133.10.17.0/24 [100/160250] via 133.10.3.2, 00:00:03, Serial0.2
O IA 133.10.51.0/24 [110/70] via 133.10.2.4, 00:03:55, Serial0.1
O IA 133.10.49.0/26 [110/212] via 133.10.2.4, 00:03:55, Serial0.1
O IA 133.10.49.0/24 [110/128] via 133.10.2.4, 00:03:55, Serial0.1
O IA 133.10.65.0/26 [110/148] via 133.10.2.4, 00:03:55, Serial0.1
O IA 133.10.65.0/24 [110/138] via 133.10.2.4, 00:03:55, Serial0.1
O IA 192.168.1.0/24 [110/139] via 133.10.2.4, 00:03:55, Serial0.1 <<<--
r1#
----------------------------------------------
shut down s0.1 from frame relay switch:
r10-frsw#sh frame route
Input Intf Input Dlci Output Intf Output Dlci Status
Serial1/0 110 Serial1/1 111 active
Serial1/0 120 Serial1/2 121 inactive
Serial1/0 130 Serial1/3 131 inactive
Serial1/1 111 Serial1/0 110 active
Serial1/2 121 Serial1/0 120 active
Serial1/3 131 Serial1/0 130 active
r10-frsw#
----------------------------------------------
ISDN kicks in:
r1#sir
Gateway of last resort is not set
192.168.200.0/32 is subnetted, 1 subnets
C 192.168.200.1 is directly connected, Loopback192
128.200.0.0/24 is subnetted, 1 subnets
C 128.200.1.0 is directly connected, Loopback128
160.100.0.0/16 is variably subnetted, 2 subnets, 2 masks
B 160.100.128.0/22 [200/0] via 133.10.3.2, 01:18:22
I 160.100.0.0/16 [100/8576] via 133.10.3.2, 00:00:05, Serial0.2
133.10.0.0/16 is variably subnetted, 10 subnets, 3 masks
C 133.10.6.0/24 is directly connected, Serial1
C 133.10.5.0/24 is directly connected, BRI0
C 133.10.3.0/24 is directly connected, Serial0.2
C 133.10.5.5/32 is directly connected, BRI0
I 133.10.17.0/24 [100/160250] via 133.10.3.2, 00:00:06, Serial0.2
O IA 133.10.51.0/24 [110/10079] via 133.10.5.5, 00:01:14, BRI0
O IA 133.10.49.0/26 [110/10073] via 133.10.5.5, 00:01:14, BRI0
O IA 133.10.49.0/24 [110/10137] via 133.10.5.5, 00:01:14, BRI0
O IA 133.10.65.0/26 [110/10009] via 133.10.5.5, 00:01:14, BRI0
O IA 133.10.65.0/24 [110/10147] via 133.10.5.5, 00:01:14, BRI0
O IA 192.168.1.0/24 [110/10000] via 133.10.5.5, 00:01:14, BRI0 <<<---
r1#
----------------------------------------------
route-map check 192.168.1.0's next hop is 133.10.5.5 so it generates default
route:
r1#siod | beg -5
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 192.168.200.1 721 0x80000001 0xA873 100 <<<-
133.10.3.0 192.168.200.1 912 0x80000005 0x13C1 2
133.10.17.0 192.168.200.1 912 0x80000005 0x784E 2
192.190.102.0 192.168.200.3 983 0x80000003 0xB1AD 36
r1#
----------------------------------------------
See from the other side of ISDN:
r5#siod | beg -5
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 192.168.200.1 1 (DNA) 0x80000001 0xA873 100
133.10.3.0 192.168.200.1 1032 0x80000005 0x13C1 2
133.10.17.0 192.168.200.1 1032 0x80000005 0x784E 2
192.190.102.0 192.168.200.3 1103 0x80000003 0xB1AD 36
r5#sir
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 133.10.5.1 to network 0.0.0.0
192.168.200.0/32 is subnetted, 1 subnets
C 192.168.200.5 is directly connected, Loopback192
133.10.0.0/16 is variably subnetted, 10 subnets, 3 masks
O 133.10.6.0/24 [110/10063] via 133.10.5.1, 00:04:24, BRI0
C 133.10.5.0/24 is directly connected, BRI0
C 133.10.5.1/32 is directly connected, BRI0
O E2 133.10.3.0/24 [110/20] via 133.10.5.1, 00:04:14, BRI0
O E2 133.10.17.0/24 [110/20] via 133.10.5.1, 00:04:14, BRI0
O 133.10.51.0/24 [110/80] via 133.10.65.7, 01:22:28, Ethernet0
O IA 133.10.49.0/24 [110/138] via 133.10.65.7, 00:04:25, Ethernet0
O 133.10.49.0/26 [110/74] via 133.10.65.7, 01:22:28, Ethernet0
O IA 133.10.65.0/24 [110/148] via 133.10.65.7, 00:04:25, Ethernet0
C 133.10.65.0/26 is directly connected, Ethernet0
C 192.168.1.0/24 is directly connected, Loopback1
O*E2 0.0.0.0/0 [110/1] via 133.10.5.1, 00:04:16, BRI0
r5#
>From: "yakout esmat" <yesmat@iprimus.com.au>
>Reply-To: "yakout esmat" <yesmat@iprimus.com.au>
>To: "Bob Sinclair" <bsin@erols.com>
>CC: <ccielab@groupstudy.com>
>Subject: RE: OSPF Conditional Default Origination
>Date: Mon, 22 Apr 2002 17:55:07 +1000
>
>Bob,
>
>I actually have taken Halabi's example in Chapter 12 and tried to build my
>scenario based on that.
>
>But again, my route-map can only check for the existance of the route but
>can't check for the absence of it.
>
>What I am trying to acheive exactely is: advertise the default route, when
>my frame relay interface (physical) goes down and my ISDN (Backup)comes up.
>When this happens the router that is the source of the default route looses
>some routes because of the F/R interface lose, and has to inject the
>default
>into OSPF Domain in order for my network to be able still to reach every
>interface.
>
>But, when F/R interface is up and ISDN down(Standby mode)no default should
>be injected into OSPF Domian.
>
>Your idea, using Admin distance to control the existance of a specific
>route
>when my original route disappears is an excellent one (never thought about
>it) but the question still remains whether that would be acceptable in the
>lab exam??
>
>Thanks for your feedback, any other ideas are very much appreciated.
>
>Ya
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Bob Sinclair
>Sent: Monday, April 22, 2002 1:35 AM
>To: yakout esmat
>Cc: ccielab@groupstudy.com
>Subject: Re: OSPF Conditional Default Origination
>
>
>Yakout,
>
>BGP has the "non-exist" map syntax for the purpose you are trying to
>achieve. The fact that it has this special syntax makes me think you will
>need to test for the existence, not absence, of a route in OSPF.
>
>The best example of this is in Halabi's book. Can you arrange to advertise
>the default only if some other route is present, then arrange if this other
>route is present, then 148.5.5.0 must not be? Perhaps through metric or
>AD?
>
>I think you are correct in your understanding of the command. Cannot test
>absence of route, only presence. Make appearance of route A conditional on
>absence of 148.5.5.0, then advertise default only if A is present. If A is
>present, 148.5.5.0 must not be.
>
>-Bob
>
>
>. ----- Original Message -----
>From: "yakout esmat" <yesmat@iprimus.com.au>
>To: "Groupstudy" <ccielab@groupstudy.com>
>Sent: Sunday, April 21, 2002 6:43 AM
>Subject: OSPF Conditional Default Origination
>
>
> > Hi all,
> >
> > I have a problem configuring OSPF Conditional Default Origination, my
>config
> > as follows:
> >
> > !
> > router ospf 100
> > summary-address 198.168.0.0 255.255.0.0
> > network 148.5.6.6 0.0.0.0 area 0
> > network 148.5.16.6 0.0.0.0 area 0
> > default-information originate route-map default
> > !
> > route-map default deny 10
> > match ip address 3
> > !
> > route-map default permit 20
> > !
> > access-list 3 permit 148.5.5.0 0.0.0.255
> > !
> > end
> >
> > What I want to achieve is: If network 148.5.5.0/24 exists in the routing
> > table DO NOT advertise the default route into OSPF Domain (which is
> > represented by first instance of the route-map 10)
> >
> > Otherwise Advertise the default (which is covered by the second instance
>20)
> >
> > My observation is: it only works if the first instance permits the
>default
> > based on the EXISTANCE of the network in the table, and denies the
>default
> > if the network doesn't exist in the table.
> >
> > Do I have misunderstanding of the Conditional Default Origination or
>what??
> >
> > Any feed back is very much appreciated.
> >
> > Thanks in advance
> >
> > ya
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:16 GMT-3