Re: BGP SOO

Hi

Config is as follows om both PE's

Ignore the previous configs because I wrote them manually because I was not
at my simulator

Topology is

CE1 - - PE1 - - RR - - PE2 - - CE2
AS78 - AS1 - - AS1 - - AS1 - AS78

CE1 and CE2 have a backdoor link running iBGP

PE1 Config is as follows:

router bgp 1
 no bgp default ipv4-unicast
 bgp log-neighbor-changes
 neighbor 150.1.4.4 remote-as 1
 neighbor 150.1.4.4 update-source Loopback0
 !
 address-family vpnv4
  neighbor 150.1.4.4 activate
  neighbor 150.1.4.4 send-community both
 exit-address-family
 !
 address-family ipv4 vrf VPN_A
  neighbor 155.1.67.7 remote-as 78
  neighbor 155.1.67.7 activate
  neighbor 155.1.67.7 as-override
  neighbor 155.1.67.7 soo 100:1
  no synchronization
 exit-address-family

PE2 Config is as follows

router bgp 1
 no bgp default ipv4-unicast
 bgp log-neighbor-changes
 neighbor 150.1.4.4 remote-as 1
 neighbor 150.1.4.4 update-source Loopback0
 !
 address-family vpnv4
  neighbor 150.1.4.4 activate
  neighbor 150.1.4.4 send-community both
 exit-address-family
 !
 address-family ipv4 vrf VPN_A
  neighbor 155.1.58.8 remote-as 78
  neighbor 155.1.58.8 activate
  neighbor 155.1.58.8 as-override
  neighbor 155.1.58.8 soo 100:2
  no synchronization
 exit-address-family

CE1 Loopback 150.1.7.7
CE2 Loopback 150.1.8.8

The CE loopbacks are advertised into BGP and this is what I see on the PE's
for the remote loopbacks

PE1

sh ip bgp vpnv4 vrf VPN_A 150.1.8.0
BGP routing table entry for 100:1:150.1.8.0/24, version 14
Paths: (1 available, best #1, table VPN_A)
  Advertised to update-groups:
        2
  78
    155.1.67.7 from 155.1.67.7 (172.16.7.7)
      Origin IGP, localpref 100, valid, external, best
      Extended Community: SoO:100:1 RT:100:1
      mpls labels in/out 24/nolabel

PE2

sh ip bgp vpnv4 vrf VPN_A 150.1.7.0
BGP routing table entry for 100:1:150.1.7.0/24, version 3
Paths: (2 available, best #2, table VPN_A)
  Advertised to update-groups:
        2
  78
    150.1.6.6 (metric 66) from 150.1.4.4 (150.1.4.4)
      Origin IGP, metric 0, localpref 100, valid, internal
      Extended Community: SoO:100:1 RT:100:1
      Originator: 150.1.6.6, Cluster list: 150.1.4.4
      mpls labels in/out 21/20
  78
    155.1.58.8 from 155.1.58.8 (172.16.8.8)
      Origin IGP, localpref 100, valid, external, best
      Extended Community: SoO:100:2 RT:100:1
      mpls labels in/out 21/nolabel

I find it really strange that PE1 is only receiving one update from its
local CE whereas PE2 receives 2 updates, one from remote PE and one from
local CE as I would expect.

On 28 May 2010 00:17, Adrian Brayton <abrayton_at_gmail.com> wrote:

> What does your vpnv4 information look like on the PE routers? Can you send
> there configuration?
>
> Sent from my iPad
>
> On May 27, 2010, at 6:36 PM, Muzammil Malick <malickmuz_at_gmail.com> wrote:
>
> > Hi All
> >
> > I have an issue when configuring BGP SOO. My topology is as follows
> >
> > CE1 - - PE1 - - RR - - PE2 - - CE2
> > AS1 - - AS2 - - AS2 - - AS2 - - AS1
> >
> > The CEs have a backdoor link via iBGP
> >
> > My config for the PE's is as follows
> >
> > PE1
> >
> > address-family ipv4 vrf VRF_A
> > neighbor 150.0.0.1 remote-as 1
> > neighbor 150.0.0.1 activate
> > neighbor 150.0.0.1 as-override
> > neighbor 150.0.0.1 soo 100:1
> > no synchronization
> > exit-address-family
> >
> > PE2
> >
> > address-family ipv4 vrf VRF_A
> > neighbor 160.0.0.1 remote-as 1
> > neighbor 160.0.0.1 activate
> > neighbor 160.0.0.1 as-override
> > neighbor 160.0.0.1 soo 100:2
> > no synchronization
> > exit-address-family
> >
> > I was under the impression that because the SOO values are different that
> > the routes will be sent to the CEs. However my PEs are not advertising
> > remote CE routes to local CE
> > and I can see clearly from "show ip bgp neighbor command" that there is
> an
> > SOO loop on the PEs.
> > Do I have this wrong?
> >
> > Thanks
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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Received on Fri May 28 2010 - 05:36:17 ART