From: MADMAN (dave@interprise.com)
Date: Thu Jan 16 2003 - 11:46:43 GMT-3
Like I figured, you have flaged a network as default with the ip
default-network x.x.x.x command. This is generally used with IGRP, can
be used with EIGRP but EIGRP also understands 0.0.0.0.
Dave
cebuano wrote:
> Dave,
> I'm working on this Practical Design page...
> http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm#xtocid2
> 043946
> And I just happened to notice this. I've never mocked up a lab to give
> me this Gateway of Last Resort and a quad zero in the routing table so
> this is a first for me.
>
> Dimitris sent me the link that explains what I'm seeing...
> http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a
> 0080094374.shtml
>
> Here's the config...
> Thanks again.
> Elmer
>
> 2511#s
> !
> interface Loopback10
> ip address 203.250.13.41 255.255.255.0
> !
> interface Ethernet0
> ip address 203.250.14.1 255.255.255.0
> !
> interface Serial0
> ip address 128.213.63.1 255.255.255.252
> !
> router ospf 10
> redistribute bgp 100 metric 2000 subnets
> passive-interface Serial0
> network 128.213.0.0 0.0.255.255 area 0
> network 203.250.0.0 0.0.255.255 area 0
> default-information originate metric 2000
> !
> router bgp 100
> no synchronization
> network 203.250.13.0
> network 203.250.14.0
> neighbor 128.213.63.2 remote-as 200
> neighbor 128.213.63.2 route-map setlocalpref in
> neighbor 203.250.15.2 remote-as 100
> neighbor 203.250.15.2 update-source Loopback0
> !
> ip default-network 200.200.0.0
> !
> route-map setlocalpref permit 10
> set local-preference 200
> !
> !
>
>
>
> MC3810b#s
> !
> interface Ethernet0
> ip address 192.208.10.6 255.255.255.252
> !
> interface Serial1
> ip address 203.250.15.2 255.255.255.0
> !
> router ospf 10
> redistribute bgp 100 metric 1000 subnets
> passive-interface Ethernet0
> network 192.208.0.0 0.0.255.255 area 0
> network 203.250.0.0 0.0.255.255 area 0
> default-information originate metric 1000
> !
> router bgp 100
> network 203.250.15.0
> neighbor 192.208.10.5 remote-as 300
> neighbor 192.208.10.5 route-map LOCALONLY in
> neighbor 203.250.13.41 remote-as 100
> !
> ip default-network 192.208.10.0
> ip as-path access-list 1 permit ^300 500$
> ip as-path access-list 2 permit ^300$
> !
> route-map LOCALONLY permit 10
> match as-path 1
> set local-preference 300
> !
> route-map LOCALONLY permit 20
> match as-path 2
> !
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> MADMAN
> Sent: Thursday, January 16, 2003 6:58 AM
> To: cebuano
> Cc: ccielab@groupstudy.com
> Subject: Re: Gateway of last resort V.S. 0.0.0.0
>
> Do you have a "default-network" configuered on this router????
>
> Dave
>
> cebuano wrote:
>
>>Hi all,
>>Below are show output to demonstrate that Gateway of Last Resort
>>supercedes path selection when forwarding to unknown networks. If
>
> anyone
>
>>has a URL to explain this behavior, please direct me to it. Thanks.
>>
>>2511#ir
>>
>>Gateway of last resort is 128.213.63.2 to network 200.200.0.0
>>
>> 1.0.0.0/32 is subnetted, 1 subnets
>>C 1.1.1.1 is directly connected, Loopback0
>> 192.208.10.0/24 is variably subnetted, 2 subnets, 2 masks
>>O E2 192.208.10.0/24 [110/1000] via 203.250.14.2, 00:02:59,
>
> Ethernet0
>
>>O 192.208.10.4/30 [110/84] via 203.250.14.2, 00:02:59, Ethernet0
>> 203.250.15.0/24 is variably subnetted, 2 subnets, 2 masks
>>B 203.250.15.0/24 [200/0] via 203.250.15.2, 00:02:58
>>O 203.250.15.0/30 [110/74] via 203.250.14.2, 00:02:59, Ethernet0
>> 128.213.0.0/16 is variably subnetted, 2 subnets, 2 masks
>>B 128.213.0.0/16 [20/0] via 128.213.63.2, 00:02:34
>>C 128.213.63.0/30 is directly connected, Serial0
>>C 203.250.14.0/24 is directly connected, Ethernet0
>>C 203.250.13.0/24 is directly connected, Loopback10
>>O*E2 0.0.0.0/0 [110/1000] via 203.250.14.2, 00:01:08, Ethernet0
>>B* 200.200.0.0/16 [20/0] via 128.213.63.2, 00:01:13
>>O E2 195.211.0.0/16 [110/1000] via 203.250.14.2, 00:01:43, Ethernet0
>>
>>
>>2511#trace 100.100.100.1
>>
>>Type escape sequence to abort.
>>Tracing the route to 100.100.100.1
>>
>> 1 128.213.63.2 [AS 200] 16 msec 16 msec 20 msec
>> 2 128.213.63.2 [AS 200] !H * !H
>>
>>
>>MC3810b#ir
>>
>>Gateway of last resort is 192.208.10.5 to network 192.208.10.0
>>
>> * 192.208.10.0/24 is variably subnetted, 2 subnets, 2 masks
>>B* 192.208.10.0/24 [20/0] via 192.208.10.5, 00:04:49
>>C 192.208.10.4/30 is directly connected, Ethernet0
>> 203.250.15.0/30 is subnetted, 1 subnets
>>C 203.250.15.0 is directly connected, Serial1
>> 128.213.0.0/16 is variably subnetted, 2 subnets, 2 masks
>>O E2 128.213.0.0/16 [110/2000] via 203.250.15.1, 00:04:23, Serial1
>>O 128.213.63.0/30 [110/138] via 203.250.15.1, 00:04:51, Serial1
>>O 203.250.14.0/24 [110/74] via 203.250.15.1, 00:04:52, Serial1
>> 203.250.13.0/24 is variably subnetted, 2 subnets, 2 masks
>>O 203.250.13.41/32 [110/75] via 203.250.15.1, 00:04:52, Serial1
>>B 203.250.13.0/24 [200/0] via 203.250.13.41, 00:04:50
>>O*E2 0.0.0.0/0 [110/2000] via 203.250.15.1, 00:02:57, Serial1
>>O E2 200.200.0.0/16 [110/2000] via 203.250.15.1, 00:03:04, Serial1
>>B 195.211.0.0/16 [20/0] via 192.208.10.5, 00:03:33
>>
>>
>>MC3810b#trace 100.100.100.1
>>
>>Type escape sequence to abort.
>>Tracing the route to 100.100.100.1
>>
>> 1 192.208.10.5 [AS 300] 0 msec 4 msec 4 msec
>> 2 192.208.10.5 [AS 300] !H * !H
>>.
>
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"You don't make the poor richer by making the rich poorer." --Winston Churchill .
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