From: alsontra@hotmail.com
Date: Sun Feb 29 2004 - 22:11:37 GMT-3
RE: OSPF hello question?RFC 2338 say's
1. OSPF type-1 hello packets transmitted on a P2P links should have
destination address of 0.0.0.0, which means no DR.
This is most likely a bug in IOS 12.2T for P2P non_broadcast links. 0.0.0.6
is not referenced any with respect to OSPF on Cisco's website. I'm almost
positive that the address should be 0.0.0.0 for P2P links and 224.0.0.6 for
P2M links.
moving on.....
<rfc 2328>
Section 9.5
The format of an Hello packet is detailed in Section A.3.2. The
Hello Packet contains the router's Router Priority (used in
choosing the Designated Router), and the interval between Hello
Packets sent out the interface (HelloInterval). The Hello
Packet also indicates how often a neighbor must be heard from to
remain active (RouterDeadInterval). Both HelloInterval and
RouterDeadInterval must be the same for all routers attached to
a common network. The Hello packet also contains the IP address
mask of the attached network (Network Mask). On unnumbered
point-to-point networks and on virtual links this field should
be set to 0.0.0.0.
+++++++++++++++++++++++++++++++++
Section A.3.2
Designated Router
The identity of the Designated Router for this network, in the
view of the sending router. The Designated Router is identified
here by its IP interface address on the network. Set to 0.0.0.0
if there is no Designated Router.
</rfc2328>
----- Original Message -----
From: Richard Dumoulin
To: Scott, Tyson C ; alsontra@hotmail.com ; ccielab@groupstudy.com
Sent: Sunday, February 29, 2004 10:55 AM
Subject: RE: OSPF hello question?
Alsontra, I also saw this on lab 4 of IExpert but did not take the time to
research --Richard
-----Mensaje original-----
De: Scott, Tyson C [mailto:tyson.scott@hp.com]
Enviado el: domingo, 29 de febrero de 2004 5:55
Para: alsontra@hotmail.com; ccielab@groupstudy.com
Asunto: RE: OSPF hello question?
If it was 224.0.0.6 it would match OSPF designated router advertisement?
Could it be a bug in the output?
Regards,
Tyson Scott
Agilent Problem Management Team
Managed Network Services
Phone: 313-583-5812
Pager: 877-997-0811
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
alsontra@hotmail.com
Sent: Saturday, February 28, 2004 6:13 PM
To: ccielab@groupstudy.com
Subject: OSPF hello question?
Group,
Topology is simply, R2 is the hub, R1 and R3 are spokes. The spoke
routers are
configured on p2p subifs with ip ospf network type broadcast specified.
Network type is non_broadcast on R2's multi-point physical interface. R2
has
neighbor statements pointing toward the hubs, so R1and R3 become
adjacent with
R2. My question is this is a follows: When I do a debug ip ospf hello
on the
hubs, why is the destination of the hello packets 0.0.0.6? I understand
that
the network type is non_broadcast and hello packets are replicated as
unicasts
to the Hub router, but what is this 0.0.0.6 address? Is it irrelevant?
debug ip ospf hello
<output on R3, makes no since to me>
*Mar 1 01:12:31.907: OSPF: Send hello to 0.0.0.6 area 0 on Serial1/0.1
from
141.1.123.3
Alsontra
_______________________________________________________________________
Please help support GroupStudy by purchasing your study materials from:
http://shop.groupstudy.com
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Please help support GroupStudy by purchasing your study materials from:
http://shop.groupstudy.com
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Mar 05 2004 - 07:14:00 GMT-3