From: Ivan (ivan@iip.net)
Date: Wed Jan 31 2007 - 06:43:04 ART
As Brian wrote below. You must include to route-map also link23.
On Wednesday 31 January 2007 04:33, Li Guoyi wrote:
> I used Dynamip to simulate a scenario, and not sure if it is correct
>
> R1 -link12- R2 -link23 - R3
> R1 lo0, R1-link12-R2 is in OSPF
> R2 -link23 - R3, R3 lo0 is in EIGRP
>
> 1. When I redistribute EIRGP into OSPF on R2 by using "redistribute eig
> 10 subnet"
> R1 can get link23 subnet and R3's lo, which means Step two you mention
> may not be necessary?
>
> 2.If on R2, I redistributed one more thing
> Router os 1
> redistribute eig 10 subnet
> redistribute connected
>
> R1 can get R2's lo0, and still have link23, and R3' lo0
>
> 3. but if I use routemap
> Router os 1
> redistribute eig 10 sub
> redistribute connected route-map R2loopbackonly
>
> Then on R1, it will lose subnet link23
>
> So when we redistribute connected, do we always need to use route-map? I
> feel it is better we just "redistribute connected" without any route-map
>
> Can you please advise?
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Brian Dennis
> Sent: Thursday, January 25, 2007 7:35 AM
> To: Bliz Man; ccielab@groupstudy.com
> Subject: RE: Strange issues with routing
>
> Basic route redistribution on a single router is a two step process.
> The first step is to bring in the routes from the routing table for the
> protocol being redistributed (show ip route <protocol>). The second
> step is to bring in the connected interfaces that the protocol is
> enabled on (i.e. network statements).
>
> When you manually redistribute connected with a route-map you are
> breaking the second step that the router is doing for you automatically.
> This second step was done when you redistributed, in your case, OSPF
> into EIGRP. You need to match the interfaces that the router was
> bringing in for you automatically in your route-map.
>
> If you remember these two steps it will save you a lot of headaches
> going forward ;-)
>
> Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Bliz Man
> Sent: Wednesday, January 24, 2007 1:46 PM
> To: ccielab@groupstudy.com
> Subject: Strange issues with routing
>
> Hello group!
> I've got following simple topology:
>
> Sw1 -----vlan10---- f0/0 R3 s0/0
> (svi) |
>
> |---------f0/0 R4 s0/0
>
> EIGRP: f0/0@R3,R4, SVI on Sw1, OSPF - on s0/0@R3,R4
>
> I'm doing mutual redistribution on R3 and R4 :
>
> CCIE-R4#sh run | be router
> router eigrp 1
> redistribute ospf 1 metric 1000 100 255 1 1500 network 1.1.4.4 0.0.0.0
> network 1.1.10.4 0.0.0.0 no auto-summary !
> router ospf 1
> router-id 1.1.4.4
> log-adjacency-changes
> redistribute eigrp 1 subnets
> network 1.1.4.4 0.0.0.0 area 0
> network 1.1.11.4 0.0.0.0 area 0
>
> CCIE-R3#sh run | be router
> router eigrp 1
> redistribute ospf 1 metric 1000 100 255 1 1500 network 1.1.3.3 0.0.0.0
> network 1.1.10.3 0.0.0.0 no auto-summary !
> router ospf 1
> router-id 1.1.3.3
> log-adjacency-changes
> redistribute eigrp 1 subnets
> network 1.1.3.3 0.0.0.0 area 0
> network 1.1.11.3 0.0.0.0 area 0
>
>
>
> And on Sw1 I have 2 routes to 1.1.11.0/24. - simple
>
> CCIE-SW1#sir 1.1.11.1
> Routing entry for 1.1.11.0/29
> Known via "eigrp 1", distance 170, metric 2585856, type external
> Redistributing via eigrp 1
> Last update from 1.1.10.4 on Vlan13, 00:31:07 ago
> Routing Descriptor Blocks:
> 1.1.10.4, from 1.1.10.4, 00:31:07 ago, via Vlan13
> Route metric is 2585856, traffic share count is 1
> Total delay is 1010 microseconds, minimum bandwidth is 1000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
> * 1.1.10.3, from 1.1.10.3, 00:31:07 ago, via Vlan13
> Route metric is 2585856, traffic share count is 1
> Total delay is 1010 microseconds, minimum bandwidth is 1000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
>
>
>
> BUT...
> When I add some loopback on R4: lo5 on R4
>
> interface Loopback5
> ip address 5.5.5.5 255.255.255.255
> end
>
> And try to redistribute it to EIGRP through simple route-map as
> connected:
>
> CCIE-R4#sh route-map CONN
> route-map CONN, permit, sequence 10
> Match clauses:
> interface Loopback5
> Set clauses:
> Policy routing matches: 0 packets, 0 bytes
>
>
> And add this string to R3 config under EIGRP: redistribute connected
> metric 1000 100 255 1 1500 route-map CONN on Sw1 one route to
> 1.1.11.0/24 removed from RIB
>
> CCIE-SW1#sir 1.1.11.1
> Routing entry for 1.1.11.0/29
> Known via "eigrp 1", distance 170, metric 2585856, type external
> Redistributing via eigrp 1
> Last update from 1.1.10.3 on Vlan13, 00:02:15 ago
> Routing Descriptor Blocks:
> * 1.1.10.3, from 1.1.10.3, 00:02:15 ago, via Vlan13
> Route metric is 2585856, traffic share count is 1
> Total delay is 1010 microseconds, minimum bandwidth is 1000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
>
>
>
> At that moment I have "debug eigrp fsm" on Sw1:
>
>
> CCIE-SW1#debug eigrp fsm
> EIGRP FSM Events/Actions debugging is on CCIE-SW1#
> 1w2d: DUAL: rcvquery: 1.1.11.0/29 via 1.1.10.4 metric
> 4294967295/4294967295, RD is 2585856
> 1w2d: DUAL: Find FS for dest 1.1.11.0/29. FD is 2585856, RD is 2585856
> 1w2d: DUAL: 1.1.10.4 metric 4294967295/4294967295
> 1w2d: DUAL: 1.1.10.3 metric 2585856/2585600 found Dmin is 2585856
> 1w2d: DUAL: send REPLY(r1/n1) about 1.1.11.0/29 to 1.1.10.4
> 1w2d: DUAL: RT installed 1.1.11.0/29 via 1.1.10.3
> 1w2d: DUAL: dest(5.5.5.5/32) not active
> 1w2d: DUAL: rcvupdate: 5.5.5.5/32 via 1.1.10.4 metric 2585856/2585600
> 1
> CCIE-SW1#w2d: DUAL: Find FS for dest 5.5.5.5/32. FD is 4294967295, RD is
> 4294967295 found
> 1w2d: DUAL: RT installed 5.5.5.5/32 via 1.1.10.4
> 1w2d: DUAL: Send update about 5.5.5.5/32. Reason: metric chg
> 1w2d: DUAL: Send update about 5.5.5.5/32. Reason: new if
> 1w2d: DUAL: Removing dest 1.1.11.0/29, nexthop 1.1.10.4
>
>
>
> And when I remove "redistr connected" on R4 :
>
> 1w2d: DUAL: rcvquery: 5.5.5.5/32 via 1.1.10.4 metric
> 4294967295/4294967295, RD is 2585856
> 1w2d: DUAL: Find FS for dest 5.5.5.5/32. FD is 2585856, RD is 2585856
> 1w2d: DUAL: 1.1.10.4 metric 4294967295/4294967295 not found Dmin is
> 4294967295
> 1w2d: DUAL: Peer total/stub 3/0 template/full-stub 3/0
> 1w2d: DUAL: Dest 5.5.5.5/32 entering active state.
> 1w2d: DUAL: Set reply-status table. Count is 1.
> 1w2d: DUAL: Doing split horizon on Vlan13
> 1w2d: DUAL: Going from state 1 to state 3
> 1w2d: DUAL: dest(1.1.11
> CCIE-SW1#.0/29) not active
> 1w2d: DUAL: rcvupdate: 1.1.11.0/29 via 1.1.10.4 metric 2585856/2585600
> 1w2d: DUAL: Find FS for dest 1.1.11.0/29. FD is 2585856, RD is 2585856
> 1w2d: DUAL: 1.1.10.3 metric 2585856/2585600
> 1w2d: DUAL: 1.1.10.4 metric 2585856/2585600 found Dmin is 2585856
> 1w2d: DUAL: RT installed 1.1.11.0/29 via 1.1.10.3
> 1w2d: DUAL: RT installed 1.1.11.0/29 via 1.1.10.4
> 1w2d: DUAL: dest(5.5.5.5/32) active
> 1w2d: DUAL: rcvreply: 5.5.5.5/32 via 1.1.9.6 metric
> 4294967295/4294967295
> 1w2d: DUAL: reply co
> CCIE-SW1#unt is 1
> 1w2d: DUAL: Clearing handle 0, count now 0
> 1w2d: DUAL: Freeing reply status table
> 1w2d: DUAL: Find FS for dest 5.5.5.5/32. FD is 4294967295, RD is
> 4294967295
> found
> 1w2d: DUAL: send REPLY(r1/n1) about 5.5.5.5/32 to 1.1.10.4
> 1w2d: DUAL: Removing dest 5.5.5.5/32, nexthop 1.1.9.6
> 1w2d: DUAL: Going from state 3 to state 1
> 1w2d: DUAL: Removing dest 5.5.5.5/32, nexthop 1.1.10.4
> 1w2d: DUAL: No routes. Flushing dest 5.5.5.5/32
>
>
>
>
>
>
> And RIB for route 1.1.11.0/24 follows:
>
> CCIE-SW1#sir 1.1.11.1
> Routing entry for 1.1.11.0/29
> Known via "eigrp 1", distance 170, metric 2585856, type external
> Redistributing via eigrp 1
> Last update from 1.1.10.4 on Vlan13, 00:00:36 ago
> Routing Descriptor Blocks:
> 1.1.10.4, from 1.1.10.4, 00:00:36 ago, via Vlan13
> Route metric is 2585856, traffic share count is 1
> Total delay is 1010 microseconds, minimum bandwidth is 1000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
> * 1.1.10.3, from 1.1.10.3, 00:00:36 ago, via Vlan13
> Route metric is 2585856, traffic share count is 1
> Total delay is 1010 microseconds, minimum bandwidth is 1000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
>
>
>
>
>
> What's the trick????!!!!
>
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-- Ivan
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