Re: BGP SoO

Thank you Narbik for the reply- I implemented the configuration with only
neighbor command and results are same. The configuration as below

router bgp 65001
 no bgp default ipv4-unicast
 bgp log-neighbor-changes
 neighbor 3.3.3.3 remote-as 65001
 neighbor 3.3.3.3 update-source Loopback0
 !
 address-family vpnv4
  neighbor 3.3.3.3 activate
  neighbor 3.3.3.3 send-community extended
 exit-address-family
 !
 address-family ipv4 vrf CB
  neighbor 10.1.45.5 remote-as 65015
  neighbor 10.1.45.5 activate
  neighbor 10.1.45.5 as-override
  neighbor 10.1.45.5 soo 65015:1
  neighbor 10.1.100.5 remote-as 65015
  neighbor 10.1.100.5 activate
  neighbor 10.1.100.5 soo 65015:1
  no synchronization
 exit-address-family
!

Show ip bgp on R5 shows that 5.5.5.5 is not learned via R4 as expected.

R5#show ip bgp
BGP table version is 9, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network Next Hop Metric LocPrf Weight Path
* 1.0.0.0 10.1.100.4 0 65001 65015 i
*> 10.1.45.4 0 65001 65001 i
*> 5.0.0.0 0.0.0.0 0 32768 i
* 192.168.1.0 10.1.100.4 0 65001 65015 i
*> 10.1.45.4 0 65001 65001 i
*> 192.168.5.0 0.0.0.0 0 32768 i

If I remove neighbor command with soo , than I have 5.5.5.5 learned via R4
as well.

router bgp 65001
 no bgp default ipv4-unicast
 bgp log-neighbor-changes
 neighbor 3.3.3.3 remote-as 65001
 neighbor 3.3.3.3 update-source Loopback0
 !
 address-family vpnv4
  neighbor 3.3.3.3 activate
  neighbor 3.3.3.3 send-community extended
 exit-address-family
 !
 address-family ipv4 vrf CB
  neighbor 10.1.45.5 remote-as 65015
  neighbor 10.1.45.5 activate
  neighbor 10.1.45.5 as-override
  neighbor 10.1.100.5 remote-as 65015
  neighbor 10.1.100.5 activate
  no synchronization
 exit-address-family

The bgp table on R5 after removing soo on R4.

R5#show ip bgp
BGP table version is 5, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network Next Hop Metric LocPrf Weight Path
* 1.0.0.0 10.1.100.4 0 65001 65015 i
*> 10.1.45.4 0 65001 65001 i
* 5.0.0.0 10.1.100.4 0 65001 65015 i
*> 0.0.0.0 0 32768 i
* 192.168.1.0 10.1.100.4 0 65001 65015 i
*> 10.1.45.4 0 65001 65001 i
* 192.168.5.0 10.1.100.4 0 65001 65015 i
*> 0.0.0.0 0 32768 i
R5#

It would be highly appreciated, if you could test and let me know.

Thanks once again for your help.

Regards,

Bilal Hansrod

On Fri, Jun 10, 2011 at 4:41 PM, Narbik Kocharians <narbikk_at_gmail.com>wrote:

> Well.........It won't surprise me if the newer versions work that way, but
> the version/s that i tested this feature required the command, i can go back
> and test it and let you know my findings. Have you tested this?
>
> On Thu, Jun 9, 2011 at 6:11 PM, Bilal Hansrod <bilal.hansrod_at_gmail.com>wrote:
>
>> Hello experts,
>>
>> Anyone who read this post able to answer my below query or perhaps Narbik
>> who wrote this lab :). Can we implement the solution without outgoing map
>> and only with incoming map or neighbors command.
>>
>> After conducting more research , the below posts mention that outgoing map
>> is not required.
>>
>> https://supportforums.cisco.com/message/963149
>>
>>
>> Thanks in advance-
>>
>> Bilal Hansrod
>>
>> On Thu, Jun 9, 2011 at 10:10 PM, Bilal Hansrod <bilal.hansrod_at_gmail.com
>> >wrote:
>>
>> > Hello Everyone,
>> >
>> > I am having difficulty understanding one of the Narbik's BGP SoO lab.
>> Here
>> > is the lab setup removing unnecessary components :
>> >
>> > R4 acting as a PE is dual homed to R5 CE via FR p-2-p and serial link.
>> R5
>> > (CE) is advertising it's loopback 5.5.5.5 to R4 via link and it learned
>> same
>> > route back from R4. The BGP table on R5 looks like this:
>> >
>> > R5#show ip bgp
>> >
>> > BGP table version is 37, local router ID is 5.5.5.5
>> >
>> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> > internal,
>> >
>> > r RIB-failure, S Stale
>> >
>> > Origin codes: i - IGP, e - EGP, ? - incomplete
>> >
>> > Network Next Hop Metric LocPrf Weight Path
>> >
>> > * 1.0.0.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 10.1.45.4 0 65001 65001 i
>> >
>> > * 5.0.0.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 0.0.0.0 0 32768 i
>> >
>> > * 192.168.1.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 10.1.45.4 0 65001 65001 i
>> >
>> > * 192.168.5.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 0.0.0.0 0 32768 i
>> >
>> > Once I implement the BGP SoO via route-map or neighbour command, the BGP
>> > table on R5 stop learning it's loopback 5.5.5.5 from frame connection.
>> >
>> > R5#show ip bgp
>> >
>> > BGP table version is 43, local router ID is 5.5.5.5
>> >
>> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> > internal,
>> >
>> > r RIB-failure, S Stale
>> >
>> > Origin codes: i - IGP, e - EGP, ? - incomplete
>> >
>> > Network Next Hop Metric LocPrf Weight Path
>> >
>> > * 1.0.0.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 10.1.45.4 0 65001 65001 i
>> >
>> > *> 5.0.0.0 0.0.0.0 0 32768 i
>> >
>> > * 192.168.1.0 10.1.100.4 0 65001 65015 i
>> >
>> > *> 10.1.45.4 0 65001 65001 i
>> >
>> > *> 192.168.5.0 0.0.0.0 0 32768 i
>> >
>> > It's all as per plan:
>> >
>> > R4 Configuration before BGP SoO
>> >
>> > router bgp 65001
>> >
>> > no bgp default ipv4-unicast
>> >
>> > bgp log-neighbor-changes
>> >
>> > neighbor 3.3.3.3 remote-as 65001
>> >
>> > neighbor 3.3.3.3 update-source Loopback0
>> >
>> > !
>> >
>> > address-family vpnv4
>> >
>> > neighbor 3.3.3.3 activate
>> >
>> > neighbor 3.3.3.3 send-community extended
>> >
>> > exit-address-family
>> >
>> > !
>> >
>> > address-family ipv4 vrf CB
>> >
>> > neighbor 10.1.45.5 remote-as 65015
>> >
>> > neighbor 10.1.45.5 activate
>> >
>> > neighbor 10.1.45.5 as-override
>> >
>> > neighbor 10.1.100.5 remote-as 65015
>> >
>> > neighbor 10.1.100.5 activate
>> >
>> > no synchronization
>> >
>> > exit-address-family
>> >
>> > R4 Configuration after BGP SoO
>> >
>> > router bgp 65001
>> >
>> > no bgp default ipv4-unicast
>> >
>> > bgp log-neighbor-changes
>> >
>> > neighbor 3.3.3.3 remote-as 65001
>> >
>> > neighbor 3.3.3.3 update-source Loopback0
>> >
>> > !
>> >
>> > address-family vpnv4
>> >
>> > neighbor 3.3.3.3 activate
>> >
>> > neighbor 3.3.3.3 send-community extended
>> >
>> > exit-address-family
>> >
>> > !
>> >
>> > address-family ipv4 vrf CB
>> >
>> > neighbor 10.1.45.5 remote-as 65015
>> >
>> > neighbor 10.1.45.5 activate
>> >
>> > neighbor 10.1.45.5 as-override
>> >
>> > neighbor 10.1.45.5 soo 65015:1
>> >
>> > neighbor 10.1.100.5 remote-as 65015
>> >
>> > neighbor 10.1.100.5 activate
>> >
>> > neighbor 10.1.100.5 soo 65015:1
>> >
>> > no synchronization
>> >
>> > exit-address-family
>> >
>> > Now back to Narbik's configuration after BGP SoO on R4, the results are
>> > same if I do below configuration
>> >
>> > route-map TST permit 10
>> >
>> > set extcommunity soo 1:105
>> >
>> > ip extcommunity-list 1 permit soo 1:105
>> >
>> > route-map TEST deny 10
>> >
>> > match extcommunity 1
>> >
>> > route-map TEST permit 90
>> >
>> > router bgp 65001
>> >
>> > no bgp default ipv4-unicast
>> >
>> > bgp log-neighbor-changes
>> >
>> > neighbor 3.3.3.3 remote-as 65001
>> >
>> > neighbor 3.3.3.3 update-source Loopback0
>> >
>> > !
>> >
>> > address-family vpnv4
>> >
>> > neighbor 3.3.3.3 activate
>> >
>> > neighbor 3.3.3.3 send-community extended
>> >
>> > exit-address-family
>> >
>> > !
>> >
>> > address-family ipv4 vrf CB
>> >
>> > neighbor 10.1.45.5 remote-as 65015
>> >
>> > neighbor 10.1.45.5 activate
>> >
>> > neighbor 10.1.45.5 as-override
>> >
>> > neighbor 10.1.45.5 route-map TST in
>> >
>> > neighbor 10.1.45.5 route-map TEST out
>> >
>> > neighbor 10.1.100.5 remote-as 65015
>> >
>> > neighbor 10.1.100.5 activate
>> >
>> > neighbor 10.1.100.5 route-map TST in
>> >
>> > neighbor 10.1.100.5 route-map TEST out
>> >
>> > no synchronization
>> >
>> > exit-address-family
>> >
>> > R5 Configuration:
>> >
>> > router bgp 65015
>> > no synchronization
>> > bgp log-neighbor-changes
>> > network 5.0.0.0
>> > network 192.168.5.0
>> > neighbor 10.1.45.4 remote-as 65001
>> > neighbor 10.1.100.4 remote-as 65001
>> > neighbor 10.1.100.4 allowas-in
>> > no auto-summary
>> >
>> >
>> >
>> > I'm confused as why I am getting same results in terms on R5 doesn't
>> learn
>> > it's loopback 5.5.5.5 when we implement configuration in two different
>> ways.
>> > The first configuration is simple and do the same task and Narbik
>> > configuration provide same results.
>> >
>> > I am sure, if I am missing something. Can anyone please shed some light
>> on
>> > my ignorance. I apologise if the post is confusing and long, but will be
>> > highly appreciated, is some please help.
>> >
>> > Thanks,
>> >
>> > Bilal Hansrod
>>
>>
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>
>
> --
> *Narbik Kocharians
> *CCSI#30832, CCIE# 12410 (R&S, SP, Security)
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Received on Fri Jun 10 2011 - 21:39:09 ART