From: Connary, Julie Ann (jconnary@xxxxxxxxx)
Date: Tue Jan 16 2001 - 11:26:40 GMT-3
Mark,
awesome - #1 worked beautifully to solve this problem - the route is no
longer in my local
routing table causing problems with my default-gateway AND it is still
being advertised to my
EBGP neighbor.
Wow - and it was so simple in the end.
Thanks,
Julie Ann
At 08:06 PM 1/15/2001 -0500, Mark Stover wrote:
>Perfect example of why you shouldn't aggregate someone else's address...
>
>I have two ideas, haven't had a chance to try either:
>
>1.
>access-list 10 deny 170.0.0.0
>access-list 10 permit any
>router bgp 5
>distribute list 10 in
>
>2.
>You could policy route the 170.x.x.x subnets that aren't local.
>
>Mark
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Connary, Julie Ann
> > Sent: Monday, January 15, 2001 10:50 AM
> > To: ccielab@groupstudy.com
> > Subject: BGP aggregates and IGRP default networks
> >
> >
> > Hi All,
> >
> >
> > I have one I cannot figure out. I have an IGRP router that is using a
> > default-network to
> > overcome subnet mask length differences into my OSPF network.
> > Works great
> > until I
> > did the BGP part of the lab which requires an aggregate address. The
> > aggregate address puts
> > a static route to null 0 in my routing table and I can no
> > longer default
> > route to the OSPF network:
> >
> >
> >
> > OSPF Network with 24, 28 and 29 bit masks of 170.100.x.x
> > |
> > |
> > |
> > Router 5 - OSPF and IGRP
> > |
> > | 170.100.1.x/24
> > |
> > Frame-relay point-to-point link
> > |
> > |
> > |
> > Router 4 - running IGRP and BGP
> > ip default-network 200.0.5.0
> > router bgp 5
> > no auto-summary
> > network 170.100.1.0 mask 255.255.255.0
> > aggregate-address 170.0.0.0 255.0.0.0 summary-only
> >
> >
> > Now I get the following routing table on R4 and cannot get to
> > any of the
> > non 24 bit subnets in OSPF.
> > How do I fix WITHOUT using static routes on R5 that
> > "summarize" the 28 and
> > 29 bit subnets to
> > 24 bits and redistribute them into IGRP. Can I stop the
> > aggregate address
> > from being entered into
> > R4's routing table. I really only want to advertise that
> > aggregate to my
> > EBGP neighbor anyways.
> >
> > Gateway of last resort is 170.100.1.5 to network 210.0.5.0
> >
> > 170.100.0.0/24 is subnetted, 9 subnets
> > C 170.100.200.0 is directly connected, Ethernet0
> > I 170.100.233.0 [100/10476] via 170.100.1.5, 00:01:03, Serial0
> > I 170.100.129.0 [100/10476] via 170.100.1.5, 00:01:03, Serial0
> > I 170.100.150.0 [100/10476] via 170.100.1.5, 00:01:03, Serial0
> > I 170.100.68.0 [100/10476] via 170.100.1.5, 00:01:03, Serial0
> > I 170.100.67.0 [100/10476] via 170.100.1.5, 00:01:03, Serial0
> > I 170.100.64.0 [100/10476] via 170.100.1.5, 00:01:04, Serial0
> > I 170.100.65.0 [100/10476] via 170.100.1.5, 00:01:04, Serial0
> > C 170.100.1.0 is directly connected, Serial0
> > 1.0.0.0/24 is subnetted, 1 subnets
> > C 1.1.1.0 is directly connected, Loopback0
> > I* 210.0.5.0/24 [100/10476] via 170.100.1.5, 00:01:04, Serial0
> > B 205.15.150.0/24 [20/0] via 170.100.200.7, 1d18h
> > B 170.0.0.0/8 [200/0] via 0.0.0.0, 1d18h, Null0
> > <---------------this
> > entry is stopping my default-network from being usefull.
> > tserve#ping 170.100.42.241
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 170.100.42.241, timeout is
> > 2 seconds:
> > .....
> > Success rate is 0 percent (0/5)
> > tserve#
> >
> >
> > Thanks,
> >
> > Julie Ann
> >
> > --------------------------------------------------------------
> > ----------
> > Julie Ann Connary
> > | | Network Consulting Engineer
> > ||| ||| Federal Support Program
> > .|||||. .|||||. 13635 Dulles
> > Technology Drive,
> > Herndon VA 20171
> > .:|||||||||:.:|||||||||:. Pager: 1-888-642-0551
> > c i s c o S y s t e m s Email: jconnary@cisco.com
> >
> > --------------------------------------------------------------
> > ----------
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