From: Gopala Naganaboyina (gnaganab@xxxxxxxxx)
Date: Sat Oct 28 2000 - 21:25:50 GMT-3
Jack, can you give the following outputs from RtrB:
1)sho ip rou 10.1.1.0
2)sho ip bgp
3)sho ip bgp nei <ip addr of RtrA> adv
4)sho ip bgp sum
regards, Gopal
>
> ATTACHMENT part 2 message/rfc822
> From: "Jack Heney" <jheneyccie@hotmail.com>
> To: Vito.Trimlett@callisma.com
> CC: ccielab@groupstudy.com
> Subject: Re: BGP/OSPF problem
> Date: Sat, 28 Oct 2000 17:01:17 GMT
> Reply-to: "Jack Heney" <jheneyccie@hotmail.com>
>
> Rtr A:
> interface fastethernet 0/0
> ip address 10.2.1.254 255.255.255.0
> router bgp 2
> neighbor 10.2.1.253 remote-as 1
>
> RtrB:
> interface fastethernet 0/0
> ip address 10.2.1.253 255.255.255.0
> interface serial 0/0
> ip address 10.10.1.1 255.255.255.0
> encapsulation frame-relay
> ip ospf interface point-to-multipoint
> router ospf 1
> network 10.10.1.0 0.0.0.255 area 0
> router bgp 1
> neighbor 10.2.1.254 remote-as 2
> neighbor 10.10.1.2 remote-as 1
> neighbor 10.1.1.254 remote-as 1
>
> RtrC:
> interface serial 0/0
> ip address 10.10.1.2 255.255.255.0
> encapsulation frame-relay
> ip ospf interface point-to-multipoint
> interface fastethernet 0/0
> ip address 10.1.1.253 255.255.255.0
> router ospf 1
> network 10.10.1.0 0.0.0.255 area 0
> network 10.1.1.0 0.0.0.255 area 0
> router bgp 1
> neighbor 10.10.1.1 remote-as 1
> neighbor 10.1.1.254 remote-as 1
> network 10.1.1.0 mask 255.255.255.0
>
> RtrD:
> interface fastethernet 0/0
> ip address 10.1.1.254 255.255.255.0
> ip ospf priority 2
> router ospf 1
> network 10.1.1.0 0.0.0.255 area 0
> router bgp 1
> neighbor 10.1.1.253 remote-as 1
> neighbor 10.10.1.1 remote-as 1
>
> The above configuration led to RtrB NOT advertising
> 10.1.1.0 to RtrA via
> BGP....When I removed the priority command and made
> RtrC the DR, RtrB
> advertised the network to A.
>
>
> >From: "Vito Trimlett" <Vito.Trimlett@callisma.com>
> >To: <jheneyccie@hotmail.com>
> >Subject: Re: BGP/OSPF problem
> >Date: Sat, 28 Oct 2000 11:13:06 -0400
> >
> >Could you send the configs?
> >----- Original Message -----
> >From: Vito Trimlett <Vito.Trimlett@callisma.com>
> >To: Jack Heney <jheneyccie@hotmail.com>
> >Sent: Saturday, October 28, 2000 11:11 AM
> >Subject: Re: BGP/OSPF problem
> >
> >
> > > I know its soun
> > > ----- Original Message -----
> > > From: Jack Heney <jheneyccie@hotmail.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Saturday, October 28, 2000 9:47 AM
> > > Subject: BGP/OSPF problem
> > >
> > >
> > > > Intersting behavior...wondering if anyone can
> explain?
> > > >
> > > >
> RtrA---------RtrB-----------RtrC------------RtrD
> > > > BGP2 BGP1 BGP1 10.1.1.0
> BGP1
> > > >
> > > > A has neighbor relationship with B only; B,C,D
> have full-mesh of
> >neighbor
> > > > relationships
> > > > B,C,D are running OSPF (area 0)
> > > > C has a "network 10.1.1.0 mask 255.255.255.0"
> statement under BGP1
> > > >
> > > > Now, here's the strange part....I left
> synchronization on on RtrB to
> >see
> > > if
> > > > I could get it to advertise 10.1.1.0 to A via
> BGP. I figured that B
> >would
> > > > learn about 10.1.1.0 through OSPF and BGP, so
> leaving synchronization
> >on
> > > > shouldn't be a problemm. At first, B wouldn't
> advertise 10.1.1.0 to
> >A.
> >I
> > > > did a little investigating and found that D
> was the designated router
> >on
> > > the
> > > > 10.1.1.0 network. For some reason, I decided
> to try changing the DR
> >to
> >C.
> > > > After making this change, B started
> advertising 10.1.1.0 to A. I
> >couldn't
> > > > believe that this was the actual source of my
> problem, so I changed
> >the
> >DR
> > > > back to D, and B stopped advertisiing the
> network to A again. I have
> > > since
> > > > replicated this experiment and the behavior
> continues to be the same.
> >I
> > > am
> > > > using 12.07t....Can anyone explain why
> changing which router on the
> >data
> > > > link is the designated router would affect BGP
> synchronization with
> >OSPF?
> > > > I'm stumped.
> > > > Thanks,
> > > > Jack
> > > >
>
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