From: Joseph Rinehart (jjrinehart@hotmail.com)
Date: Mon Sep 16 2002 - 18:12:53 GMT-3
so doe sthis indeed creats unicast hellos?
----- Original Message -----
From: "Chris Hugo" <chrishugo@yahoo.com>
To: "ying c" <bf5tgh1@yahoo.com>; "Joseph Rinehart"
<jjrinehart@hotmail.com>; <ccielab@groupstudy.com>
Sent: Sunday, September 15, 2002 8:04 AM
Subject: Re: EIGRP Manual Neighbor Configuration/Unicast
> Ying I looked at the FAQ. The parser just includes it. A lot of commands
is Cisco's IOS does the same thing. Let me call this chicken-in-egg problem.
>
> Q. What does the neighbor statement in the EIGRP configuration section do?
>
>
> A. Although the neighbor command is accepted by the Cisco IOS. parser,
it should not be used. The neighbor statement does not behave as intended
and can have a negative effect on EIGRP neighbors. To follow the bug ID link
below and see detailed bug information, you must be a registered user and
you must be logged in.
> hth,
>
> chris hugo
>
> ying c wrote:Nieghbor command will unicast. Just don't put the
> interface into passive mode, which will stop hello
> packages.
>
> router eigrp 100
> passive-interface default
> no passive-interface Ethernet0 <<<-- cannot in
> passive mode
> no passive-interface Serial1
> network 16.1.1.0 0.0.0.255
> network 16.2.2.0 0.0.0.15
> neighbor 16.2.2.13 Ethernet0 <<<-- unicast
> no auto-summary
> no eigrp log-neighbor-changes
> !
> r2#sie nei <<<--- two neighbors
> IP-EIGRP neighbors for process 100
> H Address Interface Hold Uptime
> SRTT RTO Q Seq Type
> (sec)
> (ms) Cnt Num
> 1 16.1.1.1 Se1 10 00:49:50
> 740 4440 0 5
> 0 16.2.2.13 Et0 13 00:49:51
> 13 200 0 5 S
> r2#debug ip packet detail 199
> IP packet debugging is on (detailed) for access list
> 199
> r2#
> 00:51:39: IP: s=16.2.2.2 (local), d=16.2.2.13
> (Ethernet0), len 60, sending, proto=88 <<<- unicast
> 00:51:39: IP: s=16.1.1.2 (local), d=224.0.0.10
> (Serial1), len 60, sending broad/multicast, proto=88
>
>
> --- Joseph Rinehart wrote:
> > The net of this is that I am trying to see if there
> > is a way to force EIGRP
> > to use unicast rather than multicast for the hello
> > messages. Any ideas?
> > ----- Original Message -----
> > From: "Edward Monk"
> > To: "'Joseph Rinehart'" ;
> >
> > Sent: Friday, September 13, 2002 3:56 PM
> > Subject: RE: EIGRP Manual Neighbor
> > Configuration/Unicast
> >
> >
> > > Joseph,
> > >
> > > It supposedly should work but Cisco reports there
> > is a bug and
> > > recommends not using it. I tried to search on the
> > bug but it gives me a
> > > message about it not being able to be displayed.
> > Not sure why. Maybe a
> > > there is Cisco employee who could pull it for us
> > to see what it is?
> > >
> > > Look under "EIGRP frequently asked questions" on
> > the Cisco site and you
> > > will see a document called. "What does the
> > neighbor statement in the
> > > EIGRP configuration section do?"
> > >
> > >
> >
> http://www.cisco.com/warp/public/103/eigrpfaq.shtml#Q9
> > >
> > > Basically it says don't use it because it does
> > very bad things. Hmmmm...
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf Of
> > > Joseph Rinehart
> > > Sent: Friday, September 13, 2002 4:08 PM
> > > To: ccielab@groupstudy.com
> > > Subject: EIGRP Manual Neighbor
> > Configuration/Unicast
> > >
> > > Weird question, but I can't find any trace of this
> > on CCO.
> > >
> > > EIGRP uses multicasts to send out hellos for
> > neighbor discovery as does
> > > other routing protocols. In certain environments
> > where you cannot
> > > broadcast
> > > or multicast that can be a problem. I tried
> > programming in neighbors
> > > manually and the hellos seems to be sent out in
> > non broadcast mode.
> > >
> > > The thing is that there is NO neighbor command
> > documented for EIGRP,
> > > though
> > > I looked. I tried this on 11.2 as well as 12.0
> > code so I know it works.
> > >
> > > First, does anyone know the details about the
> > function of the
> > > undocumented
> > > neighbor command in EIGRP? Does it indeed use
> > unicast rather than
> > > multicast
> > > for hellos?
> > >
> > > Second, if this is not the case is there a way to
> > force unicast in EIGRP
> > > for
> > > hellos?
> > >
> > > Looking forward to the responses.
> > >
> > > Joe
>
>
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