From: arvindyadav@comcast.net
Date: Sun Dec 21 2003 - 17:58:16 GMT-3
I found when you do the mutual redistribution b/w two routing protocol and
use redistribute connected to advertise the connected networks in one
routing protocol, route does not appear in other protocol routing table. Is
it the default behavior or I am wrong somewhere.
My findings
r4------r6------r9
ospf eigrp
OSPF b/w R4 and r6
EIGRP b/w r6 and r9
Scenario 1 - EIGRP
if you put the network statement under EIGRP for any connected n/w, if will
appear as internal route on other eigrp neighbors.
R9#ib
Interface IP-Address OK? Method Status
Protocol
Loopback20 200.200.200.1 YES manual up
up
Serial0 110.99.69.2 YES manual up
up
router eigrp 2
network 110.99.69.0 0.0.0.255
network 200.200.200.0
no auto-summary
no eigrp log-neighbor-changes
R6#sh ip ro ei
D 200.200.200.0/24 [90/2297856] via 110.99.69.2, 00:00:57, Serial1
But if you redistribute connected, it shows as external route.
R9(config)#router ei 2
R9(config-router)#no network 200.200.200.0
R9(config-router)#redi connected
R6#sh ip ro ei
D EX 200.200.200.0/24 [170/2297856] via 110.99.69.2, 00:01:52, Serial1
Scenario 2 - EIGRP - OSPF distribution.
I have network statement for loopback20 (200.100.100.1) unders eigrp and
redistributing EIGRP into OSPF. This route appear as an external router in
OSPF.
R6#ib
Interface IP-Address OK? Method Status
Protocol
Loopback20 200.100.100.1 YES manual up
up
Serial0 110.99.1.66 YES manual up
up
Serial1 110.99.69.1 YES manual up
up
R6#
router eigrp 2
network 110.99.69.0 0.0.0.255
network 200.100.100.0
auto-summary
no eigrp log-neighbor-changes
!
router ospf 1
log-adjacency-changes
redistribute eigrp 2 subnets
network 110.99.1.66 0.0.0.0 area 0
r4
O E2 200.200.200.0/24 [110/20] via 110.99.1.66, 00:12:58, Serial0.6
4.0.0.0/24 is subnetted, 3 subnets
O E2 110.99.69.0/24 [110/20] via 110.99.1.66, 00:02:56, Serial0.6
O E2 200.100.100.0/24 [110/20] via 110.99.1.66, 00:03:28, Serial0.6
110.0.0.0/8 is variably subnetted, 16 subnets, 4 masks
I have created one more loopback21 on r6 and there is no network statement
for this network and using redistribute connected to advertise this route.
R6#ib
Interface IP-Address OK? Method Status
Protocol
Loopback20 200.100.100.1 YES manual up
up
Loopback21 150.50.50.1 YES manual up
up
Serial0 110.99.1.66 YES manual up
up
Serial1 110.99.69.1 YES manual up
up
router eigrp 2
redistribute connected route-map test1
network 110.99.69.0 0.0.0.255
network 200.100.100.0
auto-summary
no eigrp log-neighbor-changes
!
access-list 7 permit 150.50.50.0 0.0.0.255
route-map test1 permit 10
match ip address 7
But this route (loppabck21, 150.50.50.1/24) does not appear in R4 routing
table but all other roues are fine. But if I can see this router on R9 as
external.
R4#sh ip ro os
O E2 200.200.200.0/24 [110/20] via 110.99.1.66, 00:46:59, Serial0.6
O E2 5.3.3.0 [110/20] via 110.99.1.66, 00:46:59, Serial0.6
R9#sh ip ro | in 150.50.50.0
D EX 150.50.50.0 [170/2297856] via 110.99.69.1, 00:00:20, Serial0
Now I tried to redistribute connected under ospf. But here also this route
appears in R4 routing table as O E2 but not on R9. I am redistributing ospf
into eigrp as well
router eigrp 2
redistribute ospf 1 metric 1000 100 255 1 1500
network 110.99.69.0 0.0.0.255
network 200.100.100.0
auto-summary
no eigrp log-neighbor-changes
!
router ospf 1
redistribute connected subnets route-map test1
redistribute eigrp 2 subnets
network 110.99.1.66 0.0.0.0 area 0
network 110.99.100.0 0.0.0.255 area 100
Is it the default behavior or am I wrong somewhere. Because all other routes
looks perfectly fine.
thanks
Arivnd
----- Original Message -----
From: <Danny.Andaluz@triaton-na.com>
To: <arvindyadav@comcast.net>; <kasturi_cisco@hotmail.com>;
<vdadlaney@comcast.net>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, December 16, 2003 3:03 PM
Subject: RE: Redistribute Connected Issue
> 1. If on R3 eigrp is enabled on loopback 0, then why do you need to redis
> connected. Just make sure you have network statement under eigrp
>
> router eigrp 2
> net 10.0.0.0
>
> I have to "redistribute connected" for connected isis interfaces that
won't
> be redistributed with "redistribute isis" under both EIGRP AS's.
>
> 2. If both the router R2 and R3 redistribute the AS2 to AS1 then R1 will
> get two route and both will external D EX. R1 will select the better
metric
> router.
> 3 R2 will be getting this router as internal
>
> This is what I expected, but not what I saw. R2 did have a D entry for
this
> network from R3 across AS 2. R2 was sending this route to R1, but R3 was
> not. Once I added R3's loopback to the ACL for the route-map for
> redistributing connected ISIS interfaces into EIGRP 1 and 2, R1 received
the
> route from R3 and chose R3 as the best path. It still had R2's path in
the
> topology table.
>
>
> 4. If redistribution ( as2 to as1) is happening only of R3 then R1 get
only
> one router i.e from R3.
>
> Danny
>
>
> -----Original Message-----
> From: arvindyadav@comcast.net [mailto:arvindyadav@comcast.net]
> Sent: Tuesday, December 16, 2003 2:44 PM
> To: kasturi cisco; Andaluz, Danilo, Triaton/NA; vdadlaney@comcast.net
> Cc: ccielab@groupstudy.com
> Subject: Re: Redistribute Connected Issue
>
>
> 1. If on R3 eigrp is enabled on loopback 0, then why do you need to redis
> connected. Just make sure you have network statement under eigrp
>
> router eigrp 2
> net 10.0.0.0
>
> 2. If both the router R2 and R3 redistribute the AS2 to AS1 then R1 will
> get two route and both will external D EX. R1 will select the better
metric
> router.
>
> 3 R2 will be getting this router as internal
>
> 4. If redistribution ( as2 to as1) is happening only of R3 then R1 get
only
> one router i.e from R3.
>
> I have simulated and I got two routes in eigrp topo on R1 and it select
best
> route via 150.50.124.6 (R3) because of better metric.
>
> R1# sh ip ei topo
> IP-EIGRP Topology Table for process 1
>
> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
> r - Reply status
>
> P 10.1.1.0/24, 1 successors, FD is 409600
> via 150.50.124.6 (409600/128256), Ethernet0
> via 150.50.124.5 (412160/156160), Ethernet0
>
> R1#sh ip ro
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 10.0.0.0/24 is subnetted, 1 subnets
> D EX 10.1.1.0 [170/409600] via 150.50.124.6, 00:01:31, Ethernet0
>
>
> regds
> Arvind
>
> ----- Original Message -----
> From: "kasturi cisco" <kasturi_cisco@hotmail.com>
> To: <Danny.Andaluz@triaton-na.com>; <vdadlaney@comcast.net>
> Cc: <ccielab@groupstudy.com>
> Sent: Tuesday, December 16, 2003 11:07 AM
> Subject: RE: Redistribute Connected Issue
>
>
> > Danny,
> >
> > I think what possibly is happening is when u have a route-map for
> > "redi connected" on R3 u are not including the Loopback on R3. so what
> > happens is the loopback wont go from R3 to R1.Since loopback is in
> > EIGRP it reaches R2 as (D) and then R1 (D EX) and hence R1 possible
> > has only 1 route to the loopback via R2.
> >
> > Does ur R1 routing table and/or toplogy table show 2 routes for the
> > loopback. Can u post the configs with route table for all 3.
> >
> > HTH.Let us know what u find.
> >
> > Good Luck,
> > Kasturi.
> >
> > ----------------------------------------------------------------------
> > --
> >
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> > masti!
> >
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