RE: BGP MDT

What does "sh bgp ipv4 mdt all summary" and "sh bgp ipv4 mdt all" say?

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
http://www.INE.com

From: Nicky [mailto:ccienovice_at_gmail.com]
Sent: Tuesday, June 26, 2012 9:33 PM
To: Brian McGahan
Cc: ccielab_at_groupstudy.com
Subject: Re: BGP MDT

Please find the configuration:-

vrf definition CUST
 rd 100:100
 !
 address-family ipv4
 route-target export 100:100
 route-target import 100:100
 route-target import 1001:100
 mdt default 239.255.2.10

 exit-address-family
 !
 address-family ipv6
 route-target export 100:100
 route-target import 100:100
 route-target import 1001:100
 exit-address-family

=============
router bgp 100
 no bgp default ipv4-unicast
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 100
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 5.5.5.5 remote-as 100
 neighbor 5.5.5.5 update-source Loopback0

 !
 address-family ipv4
  no synchronization
  network 8.8.8.8 mask 255.255.255.255
  neighbor 2.2.2.2 activate
  neighbor 5.5.5.5 activate
  no auto-summary
 exit-address-family
 !
 address-family vpnv4
  neighbor 2.2.2.2 activate
  neighbor 2.2.2.2 send-community extended
 exit-address-family
 !
 address-family ipv4 mdt
  neighbor 5.5.5.5 activate
  neighbor 5.5.5.5 send-community extended
 exit-address-family

This is the config after removing the neighbor under mdt.Also, the IOS version
is "12.2(33)SRE2".

Cheers,
Nikhil E.
On Tue, Jun 26, 2012 at 10:27 PM, Brian McGahan
<bmcgahan_at_ine.com<mailto:bmcgahan_at_ine.com>> wrote:
That's only for versions that are pre-standard, and also only if you have the
VRF locally configured, and only if you have the default MDT configured under
the VRF. If you want to explicitly disable it then upgrade to a version that
supports the standardized BGP AFI/SAFI for IPv4 MDT.

Post your config and relevant show outputs if you're having trouble with a
specific design and I'd be more than happy to help.

HTH,

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
http://www.INE.com

On Jun 26, 2012, at 10:27 AM, "Nicky"
<ccienovice_at_gmail.com<mailto:ccienovice_at_gmail.com>> wrote:

This not a bug but IOS operation itself. Kindly go through the excerpt from
the link shared by Brian:-

"when a default MDT configuration exists and a VPNv4 neighbor in BGP is
configured, a similar neighbor in the IPv4 MDT address family will be
automatically configured."

Cheers,
Nicky
On Tue, Jun 26, 2012 at 8:46 PM, Roger Pfaeffli
<rpf23543_at_gmail.com<mailto:rpf23543_at_gmail.com>> wrote:
If you remove the neighbor from the mdt address family and it still appears in
the config under the address family, it seems to be a bug. There is nothing
like the "no bgp default ipv4 unicast". Like Brian said, if you completely
want to remove The functionality" just delete the address-family ipv4 mdt.

Regards

Roger #23543

Sent from my iPhone

On 26.06.2012, at 14:22, Nicky
<ccienovice_at_gmail.com<mailto:ccienovice_at_gmail.com>> wrote:

> Hi Brian,
>
> Kindly ignore the first sentence and please do let me know if there is any
> command similar to "no bgp default ipv4-unicast" to disable this MDT SAFI
> functionality.
>
> Cheers,
> Nicky
>
> On Tue, Jun 26, 2012 at 5:47 PM, Nicky
<ccienovice_at_gmail.com<mailto:ccienovice_at_gmail.com>> wrote:
>
>> Hi Brian,
>>
>> Even if use the command no neighbor and reload the router the
>> configuration reappears. Is there any command same as "no bgp default
>> ipv4-unicast"?
>>
>> Cheers,
>> Nicky
>>
>>
>> On Tue, Jun 26, 2012 at 5:00 PM, Brian McGahan
<bmcgahan_at_ine.com<mailto:bmcgahan_at_ine.com>> wrote:
>>
>>> MDT BGP neighbors don't get activated by default. Just like any other
>>> AFI/SAFI in BGP, e.g. VPNv4, VPNv6, etc. you have to enable it manually.
>>> You would need to add the "neighbor w.x.y.z activate" command under the
>>> address-family ipv4 mdt.
>>>
>>> For versions that a pre-standard for BGP MDT SAFI, your VPNv4 peers will
>>> also be your MDT peers. If you migrate to a newer version that supports
>>> the BGP MDT standard it will automatically activate these peers under MDT
>>> in addition to their VPNv4 configuration:
>>>
>>>
>>>
http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_mvpn.html#wp111684
1
>>>
>>> If you want to remove a peer though you simply need to say "no neighbor
>>> w.x.y.z activate" under address-family ipv4 mdt.
>>>
>>>
>>> HTH,
>>>
>>> Brian McGahan, CCIE #8593 (R&S/SP/Security)
>>> bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>
>>>
>>> Internetwork Expert, Inc.
>>> http://www.INE.com
>>>
>>> -----Original Message-----
>>> From: nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>
[mailto:nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>] On Behalf Of
>>> Nicky
>>> Sent: Tuesday, June 26, 2012 5:58 AM
>>> To: ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>
>>> Subject: BGP MDT
>>>
>>> Hi All,
>>>
>>> By default the neighbors get activated under address family ipv4 mdt.
>>>
>>> Is there any command to disable the default activation.
>>>
>>> Thanks & Regards,
>>> Nicky
>>>
>>>
>>> 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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Wed Jun 27 2012 - 09:03:31 ART