From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Sun Jul 23 2000 - 08:27:35 GMT-3
This configuration should work. I have a customer site where they
do essentially this: floating static to activate dial backup, access
list in the dialer list which makes EIGRP uninteresting and IP
interesting. It does not permit EIGRP hello to bring up the line, but
when data brings up the line, EIGRP does form neighbor relationship.
I dont necessarily advocate this approach, there are some aspects of
letting EIGRP form neighbor relationship but not maintain it that I do
not like. But the configuration should work as he described it.
Rick
On Fri, 21 Jul 2000, Sawal, Vijay wrote:
>
>
> -----Original Message-----
> From: Sawal, Vijay
> Sent: Friday, July 21, 2000 8:31 PM
> To: 'Rick Burts'
> Subject: RE: EIGRP over ISDN
>
>
> Rick,
> if this is correct the things should work. Have u tried this scenario
> practically?
>
> Thanks
>
> -----Original Message-----
> From: Rick Burts [mailto:burts@mentortech.com]
> Sent: Friday, July 21, 2000 8:20 PM
> To: Walid Fahme
> Cc: ccielab@groupstudy.com
> Subject: RE: EIGRP over ISDN
>
>
> uninteresting packets certainly do not reset the idle timer. EIGRP hello
> will not keep the line up in this configuration.
>
> Rick
>
> On Sat, 22 Jul 2000, Walid Fahme wrote:
>
> > Thanks Rick. I think you have a point. The Hello packets should establish
> > neighbor relation once the link comes up again. But don't you think the
> > hello packets will keep the link up ? Or uninteresting packets will not
> > clear the idle timer ??????
> >
> > Ciao,
> > Walid.
> >
> >
> > Look more carefully at his example. His access list did not discard
> > Hello packets, it merely made them uninteresting. If the link is
> > down, Hello will not bring it up. If the link is up, hello will be
> > exchanged and neighbor relationship will form and routes will be
> > advertised.
> >
> > Rick
> >
> > On Fri, 21 Jul 2000, Bill Dicks wrote:
> >
> > > If you filter the Hellos, then how will the two routers become neighbors
> > > unless the line is already up? If they don't become neighbors, how will
> > > routing occur and routes be exchanged?
> > >
> > > I see you have the floating static, so if your link to the WAN goes
> down,
> > > this will be the only route. BUT, since you are filtering eigrp, you
> will
> > > never become neighbors with the other router on the other side of the
> ISDN
> > > link and no routes will be exchanged. If you're going to use a floating
> > > static, use 0.0.0.0 so that all traffic goes that way (assuming of
> course
> > > that you have a normal 0.0.0.0 route when the WAN link is up). But
> without
> > > Hellos, no neighbor and no routes.
> > >
> > > Bill
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> > > Wojtek Iwanczyk
> > > Sent: Friday, July 21, 2000 1:08 PM
> > > To: aub95@emirates.net.ae; ccielab@groupstudy.com
> > > Subject: Re: EIGRP over ISDN
> > >
> > > Here is a sample config of DDR using EIGRP ... Filter eigrp "helo s"
> with
> > > the dialer list referencing an extended ip access list ...
> > >
> > >
> > > interface Dialer0
> > > description ISDN Dial-up to NY-PRI-BRI-Router
> > > ip unnumbered Loopback0
> > > no ip directed-broadcast
> > > ip nat outside
> > > encapsulation ppp
> > > bandwidth 2
> > > delay 6000
> > > dialer remote-name Router1
> > > dialer idle-timeout 90
> > > dialer string xxxxxxxxxxxxxx
> > > dialer string xxxxxxxxxxxxxx
> > > dialer pool 1
> > > dialer-group 1
> > > pulse-time 0
> > > ppp authentication chap callin
> > > ppp chap hostname xxxxx
> > > ppp chap password xxxxx
> > >
> > > router eigrp 1
> > > network 172.31.0.0
> > > no auto-summary
> > >
> > > ip route 172.31.0.0 255.255.0.0 Dialer0 240
> > >
> > >
> > > access-list 160 deny udp any any eq snmp
> > > access-list 160 deny eigrp any any
> > > access-list 160 permit ip any any
> > >
> > > dialer-list 1 protocol ip list 160
> > >
> > > Wojtek Iwanczyk
> > > Sr Support Engineer
> > > Exenet Technologies
> > > 15 E 26th Street
> > > New York, NY 10010
> > > (212) 684 7300
> > > wiwanczyk@exenet.com
> > >
> > >
> > > >>> Walid Fahme <aub95@emirates.net.ae> 07/21/00 01:14PM >>>
> > > Question:
> > >
> > > To limit Distance Vector Protocol updates on a dialup link (ISDN) we
> > > have several options (Snapshot, Watch-Group)
> > >
> > > To limit Link State OSPF updates ==> "ip ospf demand"
> > >
> > > What about EIGRP, any solution ???
> > >
> > > (Also, is there anything for IS-IS, NLSP and others ????)
> > >
> > > Appreciate your comments.
> > >
> > > Walid Fahme.
> > >
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