Re: BGP MDT

sh bgp ipv4 mdt all su
BGP router identifier 8.8.8.8, local AS number 100
BGP table version is 7, main routing table version 7
5 network entries using 740 bytes of memory
5 path entries using 280 bytes of memory
3/3 BGP path/bestpath attribute entries using 372 bytes of memory
8 BGP rrinfo entries using 192 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
7 BGP extended community entries using 328 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1936 total bytes of memory
BGP activity 42/0 prefixes, 51/0 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
*2.2.2.2 4 9 0 0 1 0 0 never
(NoNeg)* *>>> reappeared after reload*
5.5.5.5 4 9 20 7 7 0 0
00:01:46 4

sh bgp ipv4 mdt all
BGP table version is 7, local router ID is 8.8.8.8
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale, m multipath, b backup-path, x
best-external
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 100:100 (default for vrf CUST)
*>i3.3.3.3/32 3.3.3.3 0 100 0 ?
*>i4.4.4.4/32 4.4.4.4 0 100 0 ?
*>i7.7.7.7/32 7.7.7.7 0 100 0 ?
*> 8.8.8.8/32 0.0.0.0 0 ?
Route Distinguisher: 1001:100
*>i9.9.9.9/32 5.5.5.5 0 100 0 1001 ?
*>i10.10.10.10/32 5.5.5.5 0 100 0 1001 ?

2.2.2.2 is appearing because I have configured mdt default in vrf. But I
need to know why such default has been programmed by cisco.

On Wed, Jun 27, 2012 at 7:33 PM, Brian McGahan <bmcgahan_at_ine.com> wrote:

> 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****
>
> ** **
>
> 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> 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****
>
> ** **
>
> Internetwork Expert, Inc.****
>
> http://www.INE.com****
>
>
> On Jun 26, 2012, at 10:27 AM, "Nicky" <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>
> 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> 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> 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>
> 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
> >>>
> >>> Internetwork Expert, Inc.
> >>> http://www.INE.com
> >>>
> >>> -----Original Message-----
> >>> From: 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
> >>> 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
> >>>
> >>>
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> >
> >
> >****
>
> ** **
>
> ** **

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Received on Wed Jun 27 2012 - 20:52:58 ART