Re: MPLS: Unicast routing in the provider network

here is my take on it:

EIGRP uses the BGP cost community during redistribution on the PE router of
the CE routes and the idea of POI (point of insertion) and automatically
creates the bsuper backboneb for EIGRP to use the Provider link over the
backdoor links

OSPF use the SHAM link inside the VRF to create bsuper backboneb area 0
over
the Provdier network to change the link over the Provider to an IntraArea
link instead of and InterArea linkb& And the shamlink sets the cost to a
value lower than the backdoor link cost

also my thoughts on this blog post on INE:

http://blog.ine.com/2010/07/19/mpls-and-eigrp-going-the-distance-admin-distan
ce/comment-page-1/#comment-122111

and my comment:

This was really good, i had only done this type of lab before with OSPF and
sham links, it took me some digging but pretty sure this is the answer:

BGP Cost Community Support for EIGRP MPLS VPN PE-CE with Backdoor Links The
bpre-bestpathb point of insertion (POI) is applied automatically to EIGRP
routes that are redistributed into BGP. The bpre-best pathb POI carries
the
EIGRP route type and metric. This POI influences the best path calculation
process by influencing BGP to consider this POI before any other comparison
step. No configuration is required. This feature is enabled automatically
for EIGRP VPN sites when Cisco IOS Release 12.0(27)S is installed to a PE,
CE, or back door router.

http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_cost_
comm_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1054113

I was also able to turn this bon/offb with bgp bestpath cost-community
ignore

And also by making the metric extremly worse on R4 f0/1 ; R2 will choose the
path through R1 to get to 5.5.5.0

R2#sh ip route vrf v 5.5.5.0
Routing entry for 5.5.5.0/24
Known via bbgp 234b3, distance 200, metric 409600, type internal
Redistributing via eigrp 1
Advertised by eigrp 1 metric 1 10000 1 1 1
bgp 234 (self originated)
Last update from 4.4.4.4 00:16:30 ago
Routing Descriptor Blocks:
* 4.4.4.4 (Default-IP-Routing-Table), from 4.4.4.4, 00:16:30 ago
Route metric is 409600, traffic share count is 1
AS Hops 0

R4(config)#int f0/1
R4(config-if)#delay 16777215

R2#sh ip route vrf v 5.5.5.0
Routing entry for 5.5.5.0/24
Known via beigrp 1b3, distance 90, metric 2323456, type internal
Redistributing via eigrp 1, bgp 234
Advertised by bgp 234
Last update from 10.1.12.1 on FastEthernet0/0, 00:00:01 ago
Routing Descriptor Blocks:
* 10.1.12.1, from 10.1.12.1, 00:00:01 ago, via FastEthernet0/0
Route metric is 2323456, traffic share count is 1
Total delay is 26000 microseconds, minimum bandwidth is 1544 Kbit
Reliability 255/255, minimum MTU 1500 bytes
Loading 1/255, Hops 2

--
Garry L. Baker
"There is no 'patch' for stupidity." - www.sqlsecurity.com
On Thu, Sep 23, 2010 at 12:37 AM, eseosa <eseosa.ehiwe_at_gmail.com> wrote:
> Yes LDP comes up , UDP 646 is used to exchange hellos while TCP 646 is
> used to establish LDP session connection.(See RFC 3036 )
>
> Also note that LDP is used as a means to exchange labels ,  BGP can be
> used to exchange labels using the send-label option in the neighbor
> command , so you can create a LSP using BGP or LDP.
>
> On 9/23/10, eseosa <eseosa.ehiwe_at_gmail.com> wrote:
> > Hi Stephen,
> > Were Eigrp will fall short is in MPLS TE which is crucial for service
> > providers ,  for MPLS TE a true link state protocol like ISIS and OSPF
> > is required .
> >
> > On 9/23/10, Stephen Amaki <swamaki_at_gmail.com> wrote:
> >> Just to add to the earlier mail, does LDP adjacency come up as long as
> >> you
> >> can get UDP/TCP 646 across? See BGP  TCP 179
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Warm Regards,
> >
> > Eseosa
> > CCIE #23782
> > Before God we are all equally wise - and equally foolish.
> > Albert Einstein
> >
>
>
> --
> Warm Regards,
>
> Eseosa
> CCIE #23782
> Before God we are all equally wise - and equally foolish.
> Albert Einstein
>
>
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