Re: Route Reflector

Thanks for ur reply.

On Mon, May 11, 2009 at 2:45 PM, WW)W WWWW W <eshedalonie_at_gmail.com>
wrote:

> But Its best if you will config the CLUSTER-ID in order to lower the
> updates.
>
>
>
> On Mon, May 11, 2009 at 2:28 PM, WW)W WWWW W <eshedalonie_at_gmail.com>
wrote:
>
>> There won't be loops - Due to Originator ID
>>
>> See My Output
>>
>> Client Switch 3750 Configured
>> =========================
>> interface Loopback0
>> ip address 200.1.1.1 255.255.255.0
>> end
>>
>> interface Vlan1
>> ip address 172.20.1.1 255.255.255.0
>>
>> router bgp 64512
>> no synchronization
>> bgp log-neighbor-changes
>> network 10.0.0.0
>> neighbor 172.20.1.2 remote-as 64512
>> neighbor 172.20.1.2 transport path-mtu-discovery
>> neighbor 172.20.1.3 remote-as 64512
>> neighbor 172.20.1.3 transport path-mtu-discovery
>> no auto-summary
>> !
>> ip classless
>> ip route 10.0.0.0 255.0.0.0 Null0 254
>>
>> 2 Routers - which 1 of them is 3550 and second is 1841 Reflectors
>> ==================================================
>>
>> Router 1841
>> =================================
>> interface Loopback0
>> ip address 200.10.10.10 255.255.255.0
>> end
>>
>> interface FastEthernet0/0
>> ip address 172.20.1.3 255.255.255.0
>> duplex auto
>> speed auto
>> end
>>
>> router bgp 64512
>> no synchronization
>> bgp log-neighbor-changes
>> network 20.0.0.0
>> neighbor 172.20.1.1 remote-as 64512
>> neighbor 172.20.1.1 route-reflector-client
>> neighbor 172.20.1.2 remote-as 64512
>> no auto-summary
>> !
>>
>> 3550
>> =============
>> interface Loopback0
>> ip address 200.20.20.20 255.255.255.0
>> end
>>
>> interface Vlan1
>> ip address 172.20.1.2 255.255.255.0
>> end
>>
>> router bgp 64512
>> no synchronization
>> bgp log-neighbor-changes
>> network 30.0.0.0
>> neighbor 172.20.1.1 remote-as 64512
>> neighbor 172.20.1.1 route-reflector-client
>> neighbor 172.20.1.3 remote-as 64512
>> no auto-summary
>> !
>> ip route 30.0.0.0 255.0.0.0 Null0 254
>>
>>
>> OUTPUT
>> ===================
>>
>> Switch# Debug ip bgp updates
>>
>> Switch# Clear ip bgp 64512
>> 01:08:19: %BGP-5-ADJCHANGE: neighbor 172.20.1.2 Up
>> 01:08:19: BGP(0): 172.20.1.2 send UPDATE (format) 10.0.0.0/8, next
>> 172.20.1.1, metric 0, path Local
>> 01:08:19: %BGP-5-ADJCHANGE: neighbor 172.20.1.3 Up
>> 01:08:19: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 01:08:19: BGP(0): 172.20.1.3 send UPDATE (format) 10.0.0.0/8, next
>> 172.20.1.1, metric 0, path Local
>> 01:08:19: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for neighbors:
>> 01:08:19: BGP(0): 172.20.1.2 rcvd UPDATE w/ attr: nexthop 172.20.1.2,
>> origin i, localpref 100, metric 0
>> 01:08:19: BGP(0): 172.20.1.2 rcvd 30.0.0.0/8
>> 01:08:19: BGP(0): 172.20.1.2 rcvd UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0, originator 200.10.10.10, clusterlist
>> 200.20.20.20
>> 01:08:19: BGP(0): 172.20.1.2 rcvd 20.0.0.0/8
>> 01:08:19: BGP(0): Revise route installing 1 of 1 routes for 20.0.0.0/8 ->
>> 172.20.1.3(main) to main IP table
>> 01:08:19: BGP(0): Revise route installing 1 of 1 routes for 30.0.0.0/8 ->
>> 172.20.1.2(main) to main IP table
>> 01:08:19: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 172.20.1.3
>> 01:08:19: BGP(0): 172.20.1.3 rcvd UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0
>> 01:08:19: BGP(0): 172.20.1.3 rcvd 20.0.0.0/8
>> 01:08:19: BGP(0): 172.20.1.3 rcvd UPDATE w/ attr: nexthop 172.20.1.2,
>> origin i, localpref 100, metric 0, originator 200.20.20.20, clusterlist
>> 200.10.10.10
>> 01:08:19: BGP(0): 172.20.1.3 rcvd 30.0.0.0/8
>> 01:08:19: BGP(0): Revise route installing 1 of 1 routes for 20.0.0.0/8 ->
>> 172.20.1.3(main) to main IP table
>> 01:08:19: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 172.20.1.3
>> Switch#
>> Switch#
>> Switch#
>> Switch#telnet 172.20.1.2
>> Trying 172.20.1.2 ... Open
>>
>>
>> User Access Verification
>>
>> Username: cisco
>> Password:
>> 3550#clear ip bgp 6441 512
>> 3550#telnet 172.
>> 01:08:40: %BGP-5-ADJCHANGE: neighbor 172.20.1.2 Down Peer closed the
>> session20.1.3
>> Trying 172.20.1.3 ... Open
>>
>> Router#
>> 01:08:40: BGP(0): Revise route installing 1 of 1 routes for 30.0.0.0/8 ->
>> 172.20.1.2(main) to main IP table
>> 01:08:40: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for neighbors:
>> 01:08:41: BGP(0): 172.20.1.3 rcv UPDATE about 30.0.0.0/8 -- withdrawn
>> 01:08:41: BGP(0): no valid path for 30.0.0.0/8
>> 01:08:41: BGP(0): nettable_walker 30.0.0.0/8 no best path
>> 01:08:41: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for
>> neighbors:clear ip b
>> 01:08:43: BGP(0): 172.20.1.3 rcvd UPDATE w/ attr: nexthop 172.20.1.2,
>> origin i, localpref 100, metric 0, originator 200.20.20.20, clusterlist
>> 200.10.10.10
>> 01:08:43: BGP(0): 172.20.1.3 rcvd 30.0.0.0/8
>> 01:08:43: BGP(0): Revise route installing 1 of 1 routes for 30.0.0.0/8 ->
>> 172.20.1.2(main) to main IP table
>> 01:08:43: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for neighbors:
>> 01:08:44: %BGP-5-ADJCHANGE: neighbor 172.20.1.2 Up
>> 01:08:44: BGP(0): 172.20.1.2 rcvd UPDATE w/ attr: nexthop 172.20.1.2, gp
>> origin i, localpref 100, metric 0
>> 01:08:44: BGP(0): 172.20.1.2 rcvd 30.0.0.0/8
>> 01:08:44: BGP: 172.20.1.2 Local router is the Originator; Discard update
>> 01:08:44: BGP(0): 172.20.1.2 rcv UPDATE w/ attr: nexthop 172.20.1.2,
>> origin i, localpref 100, metric 0, originator 172.20.1.1, clusterlist
>> 200.20.20.20 200.10.10.10, path , community , extended community , SSA
>> attribute
>> 01:08:44: BGPSSA ssacount is 0
>> 01:08:44: BGP(0): 172.20.1.2 rcv UPDATE about 10.0.0.0/8 -- DENIED due
>> to: ORIGINATOR is us;
>> 01:08:4464512
>> Router#: BGP(0): 172.20.1.2 rcvd UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0, originator 200.10.10.10, clusterlist
>> 200.20.20.20
>> 01:08:44: BGP(0): 172.20.1.2 rcvd 20.0.0.0/8
>> 01:08:44: BGP(0): Revise route installing 1 of 1 routes for 30.0.0.0/8 ->
>> 172.20.1.2(main) to main IP table
>> 01:08:44: BGP(0): 172.20.1.2 send UPDATE (format) 10.0.0.0/8, next
>> 172.20.1.1, metric 0, path Local
>> 01:08:44: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 01:08:44: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 172.20.1.3
>> 01:08:44: BGP(0): 172.20.1.2 rcv UPDATE about 10.0.0.0/8 -- withdrawn
>> 01:08:46: BGP(0): 172.20.1.2 rcv UPDATE about 20.0.0.0/8 -- withdrawn
>> 01:08:46: BGP(0): no valid path for 20.0.0.0/8
>> 01:08:46: %BGP-5-ADJCHANGE: neighbor 172.20.1.3 Down Peer closed the
>> session
>> 01:08:46: BGP(0): nettable_walker 20.0.0.0/8 no best path
>> 01:08:46: BGP(0): updgrp 1 - 172.20.1.2 updates replicated for neighbors:
>> 01:08:46: %BGP-5-ADJCHANGE: neighbor 172.20.1.3 Up
>> 01:08:46: BGP(0): 172.20.1.3 rcvd UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0
>> 01:08:46: BGP(0): 172.20.1.3 rcvd 20.0.0.0/8
>> 01:08:46: BGP(0): Revise route installing 1 of 1 routes for 20.0.0.0/8 ->
>> 172.20.1.3(main) to main IP table
>> 01:08:46: BGP(0): 172.20.1.3 send UPDATE (format) 10.0.0.0/8, next
>> 172.20.1.1, metric 0, path Local
>> 01:08:46: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for neighbors:
>> 01:08:46: BGP(0): updgrp 1 - 172.20.1.3 updates replicated for neighbors:
>> 172.20.1.2
>> 01:08:46: BGP(0): 172.20.1.2 rcvd UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0, originator 200.10.10.10, clusterlist
>> 200.20.20.20
>> 01:08:46: BGP(0): 172.20.1.2 rcvd 20.0.0.0/8
>> 01:08:46: BGP: 172.20.1.3 Local router is the Originator; Discard update
>> 01:08:46: BGP(0): 172.20.1.3 rcv UPDATE w/ attr: nexthop 172.20.1.3,
>> origin i, localpref 100, metric 0, originator 172.20.1.1, clusterlist
>> 200.10.10.10 200.20.20.20, path , community , extended community , SSA
>> attribute
>> 01:08:46: BGPSSA ssacount is 0
>> 01:08:46: BGP(0): 172.20.1.3 rcv UPDATE about 10.0.0.0/8 -- DENIED due
>> to: ORIGINATOR is us;
>> 01:08:46: BGP(0): 172.20.1.3 rcvd UPDATE w/ attr: nexthop 172.20.1.2,
>> origin i, localpref 100, metric 0, originator 200.20.20.20, clusterlist
>> 200.10.10.10
>> 01:08:46: BGP(0): 172.20.1.3 rcvd 30.0.0.0/8
>> 01:08:46: BGP(0): 172.20.1.3 rcv UPDATE about 10.0.0.0/8 -- withdrawn
>> Router#
>> Router#
>> Router#exi
>>
>> [Connection to 172.20.1.3 closed by foreign host]
>>
>> - Show quoted text -
>>
>> On Mon, May 11, 2009 at 2:15 PM, marish shah
<contactmarish_at_gmail.com>wrote:
>>
>>> Hi Experts,
>>> One Q in bgp we use for loop prevention splithorzain That
>>> ibgp cannot passed received routes to other ibgp .But when we use rout
>>> reflector this rule failed.Then we have two options 1: originating ID 2:
>>> Cluster ID
>>> If we are using single route reflector then we use originating ID and if
>>> we
>>> have multiple route reflector then we use cluster ID to ovoid route
>>> feedback.
>>> Please correct me If I put any thing wrong.
>>>
>>> So my Q is if we have multiple route reflector and we are not using
>>> cluster
>>> ID then what happen there is loop or it use any other thing ?
>>>
>>>
>>>
>>> Thanks.
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Mon May 11 2009 - 16:57:44 ART