From: Michael Bausenwein (mikeb55@xxxxxxxx)
Date: Fri Jul 21 2000 - 16:40:12 GMT-3
actually Bill this config will work. In fact I have a similar one setup for
dial backup on many routers. You are confusing the dialer-list
functionality that decides what is interesting with and access-group (which
determines what will go over an interface). If the router loses all routes
by virtue of losing its eigrp neighbor, it will use the floating static
route. Remember that when an interface is up all traffic will pass, not
just interesting, so the eigrp neighbor relationship will come up and
propogate routes. One important thing to remember is to make sure is that
you already have a route delivered by eigrp for 0.0.0.0/0. If not when the
serial link is up, if you don't have a matching entry in the routing table,
it will use the floating static. Also Once the primary link goes back up,
the isdn will go down, due to lack of use, as it is a lower bandwidth link.
Make sure to use a very small number for bandwidth, as your router may still
use the backup link if it sees it as an equal cost path for destination that
are many hops away over slow lines.
Michael Bausenwein
Senior Network Engineer
Greenwich Technology Partners
CCIE 5865
email:mbausenwein@greenwichtech.com
----- Original Message -----
From: "Bill Dicks" <wdicks@structure-tech.com>
To: <ccielab@groupstudy.com>
Sent: Friday, July 21, 2000 2:51 PM
Subject: RE: EIGRP over ISDN
> 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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