From: Sergio Jimenez Arguedas (sejimenez@its.co.cr)
Date: Mon May 03 2004 - 15:44:43 GMT-3
Hi Devi,
I agree with you, but the doubt is the following:
___________________________________
Hi,
Mohamed, I really did it, but WITHOUT the route-map INT SFM Tx the
prefix to Side with the eigrp metric.
So, I got confused with that cmd (set metric-type internal) in BGP.
___________________________________
Thanks for your time!!!
Sergio
----- Original Message -----
From: "Devi Mallampalli" <Devi.Mallampalli@chubb.com.au>
To: "Mohamed" <nmohamed@cisco.com>; <ccielab@groupstudy.com>
Sent: Monday, May 03, 2004 7:25 AM
Subject: RE: BGP MED Scenario!!!-2nd try
> Hi Sergio & Mohamed,
>
> Let me understand this me being a late comer/listener to this Hi,
> >
> > Mohamed, I really did it, but WITHOUT the route-map INT SFM Tx the
> > prefix to Side with the eigrp metric.
> >
> > So, I got confused with that cmd (set metric-type internal) in BGP.
> conversation.
>
> Down---------------SFM-----------Side---------Up . In this topology,
> Down and SFM are running "eigrp" between them and SFM and "side" are
> running BGP between them. And you are "not" redistributing IGP in to
> Side from SFM and instead you want to publish the "inbound" IGP networks
> from Down to SFM in to the "BGP" Process at SFM. And you want to EIGRP
> routes of 200.100.100.0/24 appear at "side" as internal routes with the
> help of Router-maps & internal metric types.
>
> This is the scenario , right ?
>
> Honestly speaking with my very limited knowledge of BGP, I did not come
> across manipulating routes with the help of "metric-type" internal.
> Indeed I was in impression this kind of "metric-external types" (Type 1
> and type 2) feature is more to do with "OSPF" when you want to influence
> incoming external routes from ASBR.
>
> But when you look at your below config & outputs , I kind of agree with
> Mohamed that the route map is doing what she is suppose to do and as
> result on "side " you are indeed seeing the "inbound" eigrp route as IGP
> ( "I")
>
> 200.100.100.0 99.99.99.1 128512 0 100 I >>>>
>
> Am I thinking on right lines here ? Please elaborate the issue if you
> can.
>
> On another note from LAB exam point of view , Determining the BGP
> filtering policy (what do you want to do or what author wants to
> achieve) is more critical along with which router or interface to apply
> the policy on and the configuration part is relatively easier.
> personally speaking, I try to be little cautious in getting what the
> policy should be based on the question and more importantly where to
> apply the BGP's knobs & twiddles ( ex: AS Path prepending is always
> "out" , "community is always "out" , MED is always "out" , Local
> Preference is always "In" and Weight is always "out"...etc) as it is
> very easy to commit a mistake.
>
> Regards
>
> Devi....
>
> -----Original Message-----
> From: Mohamed [mailto:nmohamed@cisco.com]
> Sent: Monday, 3 May 2004 7:05 PM
> To: ccielab@groupstudy.com
> Subject: RE: BGP MED Scenario!!!-2nd try
>
>
> Hi all,
>
> 2nd try, can anyone help on this!!
>
> Thanks
> Mohamed.
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Sergio Jimenez Arguedas
> Sent: Friday, April 30, 2004 8:35 PM
> To: ccielab@groupstudy.com
> Subject: Fw: BGP MED Scenario!!!
>
>
> Hi Group
>
> Is someone able to help us, please?
>
>
> Rgds,
>
> Sergio Jiminez A.
>
>
> ----- Original Message -----
> From: "Mohamed" <nmohamed@cisco.com>
> To: "'Sergio Jimenez Arguedas'" <sejimenez@its.co.cr>;
> <ccielab@groupstudy.com>
> Sent: Friday, April 30, 2004 12:10 AM
> Subject: RE: BGP MED Scenario!!!
>
>
> > Hi,
> > Sergio,
> > Yeah, really I also don't know,hope someone would be able to help us..
> >
> >
> > Thanks
> > Mohamed.
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Sergio Jimenez Arguedas
> > Sent: Thursday, April 29, 2004 8:27 PM
> > To: ccielab@groupstudy.com
> > Subject: Fw: BGP MED Scenario!!!
> >
> >
> >> >
> > Thanks,
> > Sergio
> >
> >
> > ----- Original Message -----
> > From: "Mohamed" <nmohamed@cisco.com>
> > To: "'Sergio Jimenez Arguedas'" <sejimenez@its.co.cr>;
> > <ccielab@groupstudy.com>
> > Sent: Thursday, April 29, 2004 12:56 AM
> > Subject: RE: BGP MED Scenario!!!
> >
> >
> > > Hi,
> > > I got your question, sorry I couldnot spare time to do in OSPF!.
> > >
> > > SFM#sh ip route eigrp
> > > 20.0.0.0/24 is subnetted, 1 subnets
> > > D 20.1.1.0 [90/28416] via 25.25.25.26, 00:01:31,
> FastEthernet3/6
> > > 200.100.100.0/24 is variably subnetted, 2 subnets, 2 masks
> > > D 200.100.100.0/24
> > > [90/128512] via 25.25.25.26, 00:01:31, FastEthernet3/6
> > > 201.100.100.0/24 is variably subnetted, 2 subnets, 2 masks
> > > D 201.100.100.0/24
> > > [90/128512] via 25.25.25.26, 00:01:31, FastEthernet3/6
> > >
> > > Note the metric on eigrp route-128512 for network 200.100.100.0/24
> > >
> > > Now -
> > > SFM#sh run | b router bgp
> > > router bgp 100
> > > no synchronization
> > > bgp log-neighbor-changes
> > > network 200.100.100.0 <<<<<<<<<<<<<<<<
> > > network 201.100.100.0 <<<<<<<<<<<<<<<<<
> > > neighbor 25.25.25.26 remote-as 100
> > > neighbor 99.99.99.2 remote-as 300
> > > neighbor 99.99.99.2 route-map INT out
> > > no auto-summary
> > >
> > > So here iam advertising network 200.100.100.0.
> > >
> > > Down---------------SFM-----------Side---------Up
> > >
> > > From down to sfm router,I run eigrp and down advertise 200.100.100.0
>
> > > and 201.100.100.0 as eigrp routes to sfm router. I DON'T
> > > REDISTRIBUTE EIGRP HERE!!!! In SFM. I advertise using network
> > > command.I set a route-map to Side router. Now see what the route-map
>
> > > is
> > >
> > >
> > > ip as-path access-list 9 permit .*
> > > route-map INT permit 10
> > > match as-path 9
> > > set metric-type internal
> > > End
> > >
> > >
> > > So BGP set the metric of the advertised routes 200.100.100.0 and
> > > 201.100.100.0 to Side as Eigrp metric=128512 . Side#sh ip bgp BGP
> > > table version is 78, local router ID is 213.1.4.1 Status codes: s
> > > suppressed, d damped, h history, * valid, > best, i - internal
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric LocPrf Weight Path
> > > *> 200.100.100.0 99.99.99.1 128512 0 100 i
> > > *> 201.100.100.0 99.99.99.1 128512 0 100 i
> > > Side#
> > >
> > > I think it don't do anyother job than this!!
> > >
> > > Thanks
> > > Mohamed.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>
> > > Of Sergio Jimenez Arguedas
> > > Sent: Wednesday, April 28, 2004 10:08 PM
> > > To: ccielab@groupstudy.com
> > > Subject: Fw: BGP MED Scenario!!!
> > >
> > >
> > > Hi Mohamed,
> > >
> > >
> > > I really understand that, but the doubt is the following,
> > >
> > > 172.16.0.0------RA-------------RB-------------RC-------------RD
> > >
> > >
> > > Config RB
> > >
> > >
> > > router bgp 1
> > > netw 172.16.0.0
> > > neighbor x.x.x.x remote-as 2
> > >
> > >
> > > RBsi
> > > Tx the prefix if it has a route of 172.16.0.0 in the routing table.
>
> > > RB Rx the route from RA by ospf, So RB tx the prefix with the IGP
> > > metric to RC without THE ROUTE-MAP with set metric-type internal.
> > >
> > >
> > > Question: How can I use a route-map with set metric-type internal?
> > >
> > >
> > > Thanks,
> > >
> > >
> > > Sergio
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Mohamed" <nmohamed@cisco.com>
> > > To: "'Sergio Jimenez Arguedas'" <sejimenez@its.co.cr>;
> > > <ccielab@groupstudy.com>
> > > Sent: Wednesday, April 28, 2004 1:20 AM
> > > Subject: RE: BGP MED Scenario!!!
> > >
> > >
> > > > I tried in my router,
> > > >
> > > > A----------B----------C---------D
> > > >
> > > > A,B are IBGP,running OSPF.
> > > > B redistributing OSPF into BGP.
> > > > C is EBGP of B.
> > > > D is Ebgp of C
> > > >
> > > > Now in C,we get the metrics from B,bcoz C only reset the metric to
>
> > > > zero. In D we don't get metric.
> > > >
> > > >
> > > > Now if u put route-map and set metric-type int or even set origin
> > > > igp,I don't get any mteric in D,bcoz MED is a optional
> > > > Non-transitive attribute,which never passed to EBGP peers.
> > > >
> > > >
> > > > Thanks
> > > > Mohamed.
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > > > Behalf
> >
> > > > Of Sergio Jimenez Arguedas
> > > > Sent: Wednesday, April 28, 2004 2:29 AM
> > > > To: ccielab@groupstudy.com
> > > > Subject: BGP MED Scenario!!!
> > > >
> > > >
> > > > Hi Group,
> > > >
> > > > I have a question about BGP MED, the scenario is the following:
> > > >
> > > >
> > > >
> > > > --------------EB GP----------------------R4
> > > > OSPF |
> > > > |ibgp
> > > > NETA
> > > > ----------R1------------------------------R2------------EBGP------
> > > > --
> > > > --
> > > > --
> > > > -----
> > > > -----R3-------------EBGP-----------------R5
> > > >
> > > >
> > > > R1 Tx NETA to R2 by OSPF and R2 Tx NetA to R3/R4 by EBGP. R3 and
> > > > R4 Rx
> > >
> > > > NETA with the IGP (OSPF) metric. When R3 Tx the route R5, R5 Rx
> > > > the route with the metric 0. I understood it, but I have the
> > > > following
> > > > question:
> > > >
> > > >
> > > > If I apply a route-map from R3 to R5 with set metric-type
> > > > internal.......This would cause BGP routes to carry the internal
> > > > IGP
> >
> > > > metric as the BGP MED?
> > > >
> > > > R3/R4 carried the IGP metric without a route-map in R2.
> > > >
> > > >
> > > >
> > > > Could you help me, please?
> > > >
> > > >
> > > > Reference: HALABI Pag_340
> > > >
> > > >
> > > >
> > > > Rgds,
> > > >
> > > >
> > > > Sergio Jiminez A.
> > > >
> > > > __________________________________________________________________
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