Priscilla,
My apologies for the inaccuracy. Indeed, on a Serial link (point-to-point)
the neighbor state does advance to FULL. Not stopping at 2-way as I had
suggested. I config'd my lab quickly this morning for point-to-point, below
are some snapshots:
Neighbor ID Pri State Dead Time Address Interface
144.223.8.1 1 FULL/ - 00:00:39 10.0.0.37 Serial1
rtrB#debug ip ospf adj
OSPF adjacency events debugging is on
rtrB#
4d22h: OSPF: Rcv hello from 144.223.8.1 area 0 from Serial1 10.0.0.37
4d22h: OSPF: End of hello processing
4d22h: OSPF: Rcv hello from 144.223.8.1 area 0 from Serial1 10.0.0.37
4d22h: OSPF: End of hello processing
rtrB#debug ip ospf packet
4d22h: OSPF: rcv. v:2 t:1 l:48 rid:144.223.8.1
aid:0.0.0.0 chk:50AC aut:0 auk: from Serial1
4d22h: OSPF: rcv. v:2 t:1 l:48 rid:144.223.8.1
aid:0.0.0.0 chk:50AC aut:0 auk: from Serial1
4d22h: OSPF: rcv. v:2 t:1 l:48 rid:144.223.8.1
The debug ip ospf packet is interesting. In this case, you get to see the
pieces of the hello protocol broken up.
v = VERSION
t = TYPE (1 identifies this as an Hello packet)
rid = ROUTER ID (I have a Loopback 0 and 1, 1's address is 144.223.8.1)
aid = AREA ID (Area 0)
chk = CHECKSUM
aut = AUTHENTICATION (I don't have authentication configured so it's 0,
null)
auk = AUTHENTICATION KEY.
Unfortunately I can't find a debug to tell that my Hellos are multicast
rather than unicast. I guess I'll have to wait until Priscilla ponies up the
$ for a WAN sniffer. :)
Chris
-----Original Message-----
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: Monday, January 14, 2002 10:44 PM
To: [EMAIL PROTECTED]
Subject: RE: Encapsulation Failed [7:31916]
At 10:04 PM 1/14/02, Kane, Christopher A. wrote:
>Yes, OSPF sends hellos on Serial interfaces. In point-to-point networks
>OSPF's hello is multicast. There is no DR/BDR so it's my understanding that
>it simply becomes a Master/Slave relationship.
During the database description exchange state, the routers are in a
master/slave relation. For the rest of the time, the adjacent neighbors are
just friendly peers, wouldn't you say?
>Mindful that in OSPF a Neighbor is not the same as an Adjacency. All
routers
>become neighbors (assuming all aspects of the Hello protocol are agreed
>upon) They only become Adjacent with the respective DR and BDR of the
>network in the case of a network on a broadcast medium.
We're talking about non-broadcast WAN networks......
>I'm pretty sure you
>only see "2-way" as a neighbor state on point-to-point links rather than
I should try it, but I thought 2-way was an intermediate state, regardless
of the type of network.
>seeing "Full" as on a broadcast medium.
>
>I'd need someone else to chime in on point-to-multipoint as I haven't
>configured that lately.
>
>Chris
>
>-----Original Message-----
>From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
>Sent: Monday, January 14, 2002 8:40 PM
>To: [EMAIL PROTECTED]
>Subject: Re: Encapsulation Failed [7:31916]
>
>
>At 07:57 PM 1/14/02, s vermill wrote:
> >Priscilla,
> >
> >May I ask what led you to believe that bridging was involved as opposed
to
> >just assuming that the source address was the Cisco router itself?
>
>Good question. The IBM 6611 does bridging for one thing. The other hint was
>that it was attempting to send an OSPF Hello on a serial interface. Does
>OSPF do that? How does it establish adjacency to a neighbor router on a
>WAN? On a point-to-point network, I figured it just knew who its neighbor
>was.
>
>On a non-broadcast, multiple-access network, such as Frame Relay, you
>normally configured the neighbor command.
>
>I've only seen the OSPF multicast Hellos on LANs, (but I can't afford a WAN
>Sniffer anymore! ;-)
>
>Gurus? Help? Thanks.
>
>Priscilla
>
>P.S. Anyone seeing this may be confused because you didn't include the
>original message. PLEASE, people, reply with the body of the message in the
>reply. We work in connectionless, stateless mode. How do you expect anyone
>to easily connect this to the discussion about a router failing to forward
>a packet on a PPP link to an IBM 6611. Hello?????
>
>
> >Just as an opportunity to learn something.
> >
> >Regards,
> >
> >Scott
>________________________
>
>Priscilla Oppenheimer
>http://www.priscilla.com
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=32008&t=31916
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