From: Aidan Marks (amarks@cisco.com)
Date: Tue Jan 07 2003 - 21:11:14 GMT-3
At 04:48 AM 8/01/2003, syv wrote:
>On Tuesday, January 07, 2003, Aidan Marks wrote:
>
>Sorry to butt in but... It's actually about ATM and EIGRP. I
>don't have access to an ATM so I cannot test it.
>
>1. I went through your config and there is one thing that
>puzzles me:
>
> There is no broadcast on the pvc
> and no neighbor
the dynamic arp entry is broadcast
7200-1#sh atm map
Map list ATM6/0_ATM_ARP : DYNAMIC
arp maps to NSAP 47.111122223333444455556666.666666666666.00
, connection up, VC 60, VPI 0, VCI 64, ATM6/0
ip 172.31.69.6 maps to NSAP 47.111122223333444455556666.666666666666.00
, broadcast, connection up, VC 60, VPI 0, VCI 64, ATM6/0
>I thought that the broadcast or neighbor was needed for
>EIGRP to form the neighboring relationship.
>
>2. Why are you using both?
> atm pvc 1 0 5 qsaal
> atm pvc 2 0 16 ilmi
qsaal is the signalling PVC for the SVCs. I don't live in the ATM world so
I plead ignorance usually, however I believe the ilmi pvc is there so the
router, apart from management functions, keepalives etc, auto registers the
address with the ls1010 (you can see this with the show atm ilmi-status on
the ls1010, if you don't have ilmi it doesn't register), otherwise I would
have to define the full nsap and put manual atm routes on the ls1010 I
think? This is what I was seeing. Of course what I say on this topic may
not be accurate and therefore ATM guru input welcome.
Aidan
>Any further information will be appreciated.
>
>Thanks
>
>-----Original Message-----
>AM> 7200-1#sh ip route eigrp | i Null
>AM> D 172.0.0.0/8 is a summary, 03:27:37, Null0
>AM> 7200-1#sh ip route 172.0.0.0
>AM> Routing entry for 172.0.0.0/8, supernet
>AM> Known via "eigrp 1", distance 5, metric 18944, type internal
>AM> Redistributing via eigrp 1
>AM> Routing Descriptor Blocks:
>AM> * directly connected, via Null0
>AM> Route metric is 18944, traffic share count is 1
>AM> Total delay is 80 microseconds, minimum bandwidth is 151515 Kbit
>AM> Reliability 255/255, minimum MTU 4470 bytes
>AM> Loading 1/255, Hops 0
>
>AM> [snip]
>
>AM> interface ATM6/0
>AM> description #TO LS1010-3-0-0#
>AM> ip address 172.31.69.9 255.255.255.0
>AM> ip authentication mode eigrp 1 md5
>AM> ip authentication key-chain eigrp 1 ccie
>AM> ip summary-address eigrp 1 172.0.0.0 255.0.0.0 5
>AM> atm pvc 1 0 5 qsaal
>AM> atm pvc 2 0 16 ilmi
>AM> atm esi-address 999999999999.00
>AM> atm ilmi-keepalive
>AM> atm arp-server nsap 47.111122223333444455556666.666666666666.00
>
>AM> [snip]
>
>AM> router eigrp 1
>AM> passive-interface default
>AM> no passive-interface ATM6/0
>AM> network 172.31.69.0 0.0.0.255
>AM> no auto-summary
>AM> no eigrp log-neighbor-changes
>
>AM> [snip]
>
>AM> The creation of a null0 route for an ip eigrp summary address with an
>AD of
>AM> 5 is stated here in the docs, e.g.
>
>AM>
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c/1cprt1/1ceigrp.htm
>
>AM> If there is a place on CCO suggesting that the summary address is not
>AM> installed in the RIB when AD < 255, then this is probably a doc bug.
>
>AM> Aidan
>
>AM> At 07:30 PM 7/01/2003, Sage Vadi wrote:
>
> >>As Tim indicated,
> >>
> >>R7#sh ip route 192.168.0.0
> >>~cut~
> >>* directly connected, via Null0 <--
> >>~cut~
> >>
> >>Q) Why should it show admin distance locally, when it
> >>has a directly connected Null0? Have you got this in
> >>your lab? Please paste your output and show commands
> >>if you do.
> >>
> >>
> >> --- Aidan Marks <amarks@cisco.com> wrote: > sh ip
> >>route 192.168.0.0 and it will show the
> >> > distance in the verbose view.
> >> >
> >> > At 05:55 PM 7/01/2003, Sage Vadi wrote:
> >> >
> >> > >Aidan,
> >> > >
> >> > >Locally on the ABR this is what it gets -
> >> > >
> >> > >D 192.168.0.0/22 is a summary, 00:52:38, Null0
> >> > >
> >> > >There is no indication of AD.
> >> > >
> >> > >I'm going to test with another IOS.
> >> > >
> >> > >Cheers,
> >> > >Sage
> >> > >
> >> > >
> >> > > --- Aidan Marks <amarks@cisco.com> wrote: > At
> >> > 05:11
> >> > >PM 7/01/2003, Sage Vadi wrote:
> >> > > >
> >> > > > >Elmer/Cebuano,
> >> > > > >
> >> > > > >On my core router:
> >> > > > >D 192.168.0.0/22 [90/2169856] via 116.16.37.2
> >> > > > >
> >> > > > >On my ABR I have configured:
> >> > > > >ip summary-add eigrp 100 192.168.0.0
> >> > 255.255.252.0
> >> > > > 5
> >> > > > >
> >> > > > >A# To me it DOES seems that the core router
> >> > learns
> >> > > > the
> >> > > > >summarization as a InternalEIGRP route with AD
> >> > of
> >> > > > 90.
> >> > > > >
> >> > > > >This is testing with 12.2(12.5)T, I can also
> >> > test
> >> > > > with
> >> > > > >12.2(10b) if you like.
> >> > > > >
> >> > > > >Q) Anybody else know why? According to AD
> >> > charts
> >> > > > >summarized EIGRP routes = 5
> >> > > >
> >> > > > AD is local. If you look at the AD of the
> >> > summary
> >> > > > to null0 via show ip
> >> > > > route it should be 5 i.e. "distance 5". The
> >> > other
> >> > > > router picks it up as
> >> > > > just another EIGRP route (internal) and
> >> > therefore
> >> > > > gets AD 90 on the other
> >> > > > router.
> >> > > >
> >> > > > Yes?
> >> > > >
> >> > > > Aidan
> >> > > >
> >> > > >
> >> > > > >Cheers,
> >> > > > >Sage
> >> > > > >
> >> > > > > --- cebuano <cebu2ccie@cox.net> wrote: >
> >> > Hello.
> >> > > > > > I'd like to know if the command "ip
> >> > > > summary-address
> >> > > > > > eigrp" as documented
> >> > > > > > on CCO has changed. It is described under
> >> > the
> >> > > > > > command reference as
> >> > > > > > follows.
> >> > > > > >
> >> > > > > > EIGRP summary routes are given an
> >> > administrative
> >> > > > > > distance value of 5.
> >> > > > > > The administrative distance metric is used
> >> > to
> >> > > > > > advertise a summary
> >> > > > > > without installing it in the routing table.
> >> > > > > > But I'm getting two conflicting results.
> >> > > > > > 1. I don't see the admin distance of 5.
> >> > > > > > 2. I see the summary installed in the
> >> > routing
> >> > > > table.
> >> > > > > >
> >> > > > > > MC3810a(config-if)#ip summary-address eigrp
> >> > 2001
> >> > > > > > 150.100.200.0
> >> > > > > > 255.255.255.0
> >> > > > > >
> >> > > > > > MC3810a#ir
> >> > > > > >
> >> > > > > > 150.100.0.0/16 is variably subnetted, 7
> >> > > > > > subnets, 2 masks
> >> > > > > > D 150.100.200.0/24 is a summary,
> >> > 00:02:41,
> >> > > > > > Null0
> >> > > > > > C 150.100.200.0/30 is directly
> >> > connected,
> >> > > > > > Serial0
> >> > > > > > D 150.100.100.0/24 [90/2681856] via
> >> > > > > > 150.100.200.1, 00:02:07,
> >> > > > > > Serial0
> >> > > > > > D EX 150.100.2.0/24 [170/2195456] via
> >> > > > > > 150.100.200.1, 00:02:07,
> >> > > > > > Serial0
> >> > > > > > C 150.100.3.0/24 is directly
> >> > connected,
> >> > > > > > Ethernet0
> >> > > > > > D EX 150.100.1.0/24 [170/2195456] via
> >> > > > > > 150.100.200.1, 00:02:07,
> >> > > > > > Serial0
> >> > > > > > D 150.100.10.0/24 [90/2185984] via
> >> > > > > > 150.100.200.1, 00:02:09,
> >> > > > > > Serial0
> >> > > > > >
> >> > > > > > MC3810a#sh ip eigrp topo
> >> > > > > > IP-EIGRP Topology Table for
> >> > > > > > AS(2001)/ID(192.168.254.1)
> >> > > > > >
> >> > > > > > P 150.100.200.0/24, 1 successors, FD is
> >> > 2169856
> >> > > > > > via Summary (2169856/0), Null0
> >> > > > > > P 150.100.200.0/30, 1 successors, FD is
> >> > 2169856
> >> > > > > > via Connected, Serial0
> >> > > > > > P 150.100.100.0/24, 1 successors, FD is
> >> > 2681856
> >> > > > > > via 150.100.200.1
> >> > (2681856/2169856),
> >> > > > > > Serial0
> >> > > > > > P 150.100.2.0/24, 1 successors, FD is
> >> > 2195456
> >> > > > > > via 150.100.200.1 (2195456/281600),
> >> > > > Serial0
> >> > > > > > P 150.100.3.0/24, 1 successors, FD is 281600
> >> > > > > > via Connected, Ethernet0
> >> > > > > > P 150.100.1.0/24, 1 successors, FD is
> >> > 2195456
> >> > > > > > via 150.100.200.1 (2195456/281600),
> >> > > > Serial0
> >> > > > > > P 150.100.10.0/24, 1 successors, FD is
> >> > 2185984
> >> > > > > > via 150.100.200.1 (2185984/176128),
> >> > > > Serial0
> >> > > > > >
> >> > > > > > Any comments?
> >> > > > > > Thanks.
> >> > > > > > Elmer
> >> > > > > > .
> >> > > > > >
> >> > > >
> >> > >
> >> >
> >> >__________________________________________________________________
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>AM> .
>--
>Thanks
>syv@911networks.com
.
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