From: Mark Lewis (markl11@xxxxxxxxxxx)
Date: Wed Aug 16 2000 - 12:54:57 GMT-3
Hi
By default, only internal routes are redistributed from ospf if you use the
'redistribute ospf x' command (as far as I remember). I usually use 'redist
ospf x match internal external 1 external 2' for all ospf routes.
Hope that helps,
Mark
>From: "Frye, Gary" <Gary.Frye@getronics.com>
>Reply-To: "Frye, Gary" <Gary.Frye@getronics.com>
>To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
>Subject: FW: another BGP question
>Date: Tue, 15 Aug 2000 13:29:59 -0400
>
>Let me have a crack at this.
>
>1. What are your OSPF net statements? Do you have either of the
>following:
> network 0.0.0.0 255.255.255.255 area 0 [or]
> redistribute connected subnets
> (Either would cause those connected networks to find their way into
>BGP.)
>
>2. The match statements were definitely what was keeping the 192.68.5[10]
>networks out. The were external type 2.
>
>
>3. Not sure why that happened. I think your match statement is only
>including E1 and E2 OSPF routes and excluding interior-ospf routes. You
>might want a route map.
>
>
>Example:
>------------------------------
>route-map ospf-dist permit 10
> match external 1 external 2
>
>route-map ospf-dist permit 20
>------------------------------
>
>And in your routing process:
>
>-----------------------------
>router bgp 3
> redistribute ospf 1 route-map ospf-dist
> neighbor 172.16.20.1 remote-as 1
> no auto-summary
>---------------------------------
>
>
>I don't have my books with me (or a router handy), but I think that'll
>work.
>And if it doesn't, try this map instead:
>
>-------------------------------
>route-map ospf-dist permit 10
> match external 1
> match external 2
>
>route-map ospf-dist permit 20
>-------------------------------
>
>
>Let me know how it works out.
>
>Gary Frye, Team34 - Network Services
>
>-----Original Message-----
>From: Gary Frye [mailto:gfrye@carolina.rr.com]
>Sent: Saturday, August 12, 2000 10:43 PM
>To: gary.frye@getronics.com
>Subject: another BGP question
>
>
>Hello Group,
>I am seeing the following which seems
>**********RTA********
>router bgp 3
> redistribute ospf 1
> neighbor 172.16.20.1 remote-as 1
> no auto-summary
>***********
>RTA#sh ip ro
>...
>O E2 192.68.5.0/24 [110/20] via 172.16.1.2, 00:32:21, Serial0
>O E2 192.68.10.0/24 [110/20] via 172.16.1.2, 00:32:22, Serial0
>B 192.68.11.0/24 [20/0] via 172.16.20.1, 00:02:11
> 172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
>C 172.16.2.254/32 is directly connected, Loopback0
>C 172.16.220.0/24 is directly connected, Ethernet0
>C 172.16.20.0/24 is directly connected, Serial1
>C 172.16.1.0/24 is directly connected, Serial0
>O 172.16.65.0/24 [110/74] via 172.16.1.2, 00:39:37, Serial0
>************
>RTC#sh ip bgp
>BGP table version is 7, local router ID is 192.68.11.1
>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>internal
>Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
>*> 172.16.1.0/24 172.16.20.2 0 0 3 ?
>*> 172.16.2.254/32 172.16.20.2 0 0 3 ?
>*> 172.16.20.0/24 172.16.20.2 0 0 3 ?
>*> 172.16.65.0/24 172.16.20.2 74 0 3 ?
>*> 172.16.220.0/24 172.16.20.2 0 0 3 ?
>*> 192.68.11.0 0.0.0.0 0 32768 i
>************
>
>Questions
>
>Q1 I am only doing redistribute OSPF so why do see the 172.16.x.y
>networks in BGP ?
>Q2 Why are these rotues not being redistributed 192.68.5.0 and
>192.68.10.0
>Q3 If I change the redistribute statement
>***OLD
>router bgp 3
> redistribute ospf 1
> neighbor 172.16.20.1 remote-as 1
> no auto-summary
>******NEW
>router bgp 3
> redistribute ospf 1 match external 1 external 2
> neighbor 172.16.20.1 remote-as 1
> no auto-summary
>
>*******Result
>RTC#sh ip bgp
>BGP table version is 15, local router ID is 192.68.11.1
>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>internal
>Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
>*> 192.68.5.0 172.16.20.2 20 0 3 ?
>*> 192.68.10.0 172.16.20.2 20 0 3 ?
>*> 192.68.11.0 0.0.0.0 0 32768 i
>
>Question : why do the 176.16.x.y networks vanish ?
>
>
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