From: Sawal, Vijay (Vijay.Sawal@xxxxxxxxx)
Date: Fri Jul 21 2000 - 20:49:31 GMT-3
All,
This is w.r.t EIGRP over ISDN. I have a question here. As the IP traffic is
interesting, don't u think that
EIGRP Hellos will keep the Link up?
Vijay
-----Original Message-----
From: abdul_rahim@ccsi.canon.com [mailto:abdul_rahim@ccsi.canon.com]
Sent: Friday, July 21, 2000 6:14 PM
To: Walid Fahme
Cc: ccielab@groupstudy.com
Subject: RE: EIGRP over ISDN
The ideal timer is the time with refrence to Interesting traffic only ,No
matter how much the uninteresting traffic is there after the idle timer the
link will go down
Abdul
Walid Fahme <aub95@emirates.net.ae> on 07/21/2000 02:47:36 PM
Please respond to Walid Fahme <aub95@emirates.net.ae>
To: "ccielab@groupstudy.com" <ccielab@groupstudy.com>
cc: (bcc: Abdul Rahim/IS Operations/Operations/CCSI)
Subject: RE: EIGRP over ISDN
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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