From: Anand Singh \(anandksi\) (anandksi@cisco.com)
Date: Thu May 05 2005 - 14:22:25 GMT-3
Hi Gladston,
I think its related to your virtual-link config. Did you observe that
these hello messages do not come up once virtual link is stable (VL
behaves like Demand circuit). You may ignore that..It may be addressed
in later releases [12.3(03.02)T].
Thanks
-Anand
-> -----Original Message-----
-> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
-> On Behalf Of gladston@br.ibm.com
-> Sent: Wednesday, May 04, 2005 7:10 PM
-> To: Brian McGahan
-> Cc: ccielab@groupstudy.com
-> Subject: RE: 0.0.0.1 on OSPF hello
->
-> Hi,
->
-> Just studying OSPF packets characteristics on
-> point-to-point, broadcast and non-broadcast.
-> As you can see on the first post, R2 sends hello to R5 on
-> area 0 using 0.0.0.1. I am trying to understand what means
-> 0.0.0.1. It is not the area, which is 0. Debug packets
-> reveals that R2 is sending unicast, so destination address
-> is 172.16.200.7.
->
-> > >
-> > > r2#
-> > > *Mar 1 03:02:11.716: OSPF: Send hello to 0.0.0.1 area 0 on
-> > Serial0/0.257
-> > > from 172.16.200.2
-> > > *Mar 1 03:02:11.716: IP: s=172.16.200.2 (local), d=172.16.200.7
-> > > (Serial0/0.257), len 124, sending, proto=89
-> > >
->
->
-> Cordially,
-> ------------------------------------------------------------------
-> Gladston
->
->
->
-> "Brian McGahan" <bmcgahan@internetworkexpert.com>
-> 04/05/2005 16:27
->
-> To
-> <ccielab@groupstudy.com>
-> cc
-> Alaerte Gladston Vidali/Brazil/IBM@IBMBR
-> Subject
-> RE: 0.0.0.1 on OSPF hello
->
->
->
->
->
->
-> What exactly are you trying to accomplish/troubleshoot? Post your
-> relevant configs and show outputs.
->
-> Brian McGahan, CCIE #8593
-> bmcgahan@internetworkexpert.com
->
-> Internetwork Expert, Inc.
-> http://www.InternetworkExpert.com
-> Toll Free: 877-224-8987 x 705
-> Outside US: 775-826-4344 x 705
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->
-> ________________________________________
-> From: gladston@br.ibm.com [mailto:gladston@br.ibm.com]
-> Sent: Wednesday, May 04, 2005 11:09 AM
-> To: Brian McGahan
-> Cc: ccielab@groupstudy.com; George He; Jim
-> Subject: RE: 0.0.0.1 on OSPF hello
->
->
-> Hi,
->
-> Thanks for the feedback.
->
-> Something is not right.
->
-> I did this test yesterday and the same 0.0.0.1 appear over
-> other area than
-> 0.
->
-> R2 is connected to R5 over multipoint s0/0.257 and to R4 over
-> point-to-point serial 0/0.24
-> R2--R4 are in area 2.
-> I made R2--R4 non-broadcast and it also receives hello 0.0.0.1.
->
-> Well, there is a virtual link between R2--R4. Maybe this
-> influences the
-> result. What do you think?
->
->
-> Cordially,
-> ------------------------------------------------------------------
-> Gladston
->
->
-> "Brian McGahan" <bmcgahan@internetworkexpert.com>
-> 04/05/2005 12:05
-> To
-> "George He" <georgeh@adstream.com>, "Jim" <nhatquang@thiennam.org>,
-> Alaerte Gladston Vidali/Brazil/IBM@IBMBR, <ccielab@groupstudy.com>
-> cc
->
-> Subject
-> RE: 0.0.0.1 on OSPF hello
->
->
->
->
->
->
->
-> It is just different notation. Area 0.0.0.0 is the same as area
-> 0. Area 0.0.0.1 is the same as area 1.
->
-> <RFC 2328>
-> 3.1. The backbone of the Autonomous System
->
-> The OSPF backbone is the special OSPF Area 0 (often written as
-> Area 0.0.0.0, since OSPF Area ID's are typically formatted as IP
-> addresses). The OSPF backbone always contains all area border
-> routers. The backbone is responsible for distributing routing
-> information between non-backbone areas. The backbone must be
-> contiguous. However, it need not be physically contiguous;
-> backbone connectivity can be established/maintained through the
-> configuration of virtual links.
-> </RFC 2328>
->
-> HTH,
->
-> Brian McGahan, CCIE #8593
-> bmcgahan@internetworkexpert.com
->
-> Internetwork Expert, Inc.
-> http://www.InternetworkExpert.com
-> Toll Free: 877-224-8987 x 705
-> Outside US: 775-826-4344 x 705
-> 24/7 Support: http://forum.internetworkexpert.com
-> Live Chat: http://www.internetworkexpert.com/chat/
->
->
-> > -----Original Message-----
-> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
-> On Behalf
-> Of
-> > George He
-> > Sent: Wednesday, May 04, 2005 1:54 AM
-> > To: Jim; gladston@br.ibm.com; ccielab@groupstudy.com
-> > Subject: RE: 0.0.0.1 on OSPF hello
-> >
-> > I remember that if you run OSPF on Windows 2000 box, the
-> area ID like
-> > 0.0.0.1 or something like this.
-> >
-> > Cheers
-> >
-> > George
-> > -----Original Message-----
-> > From: Jim [mailto:nhatquang@thiennam.org]
-> > Sent: Wednesday, 4 May 2005 3:32 PM
-> > To: gladston@br.ibm.com; ccielab@groupstudy.com
-> > Subject: Re: 0.0.0.1 on OSPF hello
-> >
-> > how is the config? it looks like a router-id than an ip address.
-> >
-> > ----- Original Message -----
-> > From: <gladston@br.ibm.com>
-> > To: <ccielab@groupstudy.com>
-> > Sent: Wednesday, May 04, 2005 3:55 AM
-> > Subject: 0.0.0.1 on OSPF hello
-> >
-> >
-> > > Do you know what OSPF means with 0.0.0.1?
-> > >
-> > > It is a non-broadcast net, R2 is sending hello to R5.
-> Debug ip ospf
-> > hello
-> > > and debug ip packet det are enabled.
-> > >
-> > > Send hello to 0.0.0.1
-> > >
-> > > Debug ip packet confirms that the destination IP of the hello is
-> > unicast
-> > > address. Area is 0.
-> > >
-> > >
-> > > r2#
-> > > *Mar 1 03:02:11.716: OSPF: Send hello to 0.0.0.1 area 0 on
-> > Serial0/0.257
-> > > from 172.16.200.2
-> > > *Mar 1 03:02:11.716: IP: s=172.16.200.2 (local), d=172.16.200.7
-> > > (Serial0/0.257), len 124, sending, proto=89
-> > >
-> > >
-> > > When the network is broadcast, it says "Send hello to 224.0.0.5"
-> which
-> > > really is the destination IP.
-> > > But when it is non-broadcast, it seems there is no sense on
-> "0.0.0.1".
-> > > (well, I must say, I could not find the sense, hope
-> feedback clarify
-> > it).
-> > >
-> > > r2#sh deb con
-> > > *Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on
-> > Ethernet0/0
-> > > from 172.16.26.2
-> > > *Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on
-> > Ethernet0/1
-> > > from 172.16.29.2
-> > >
-> > >
-> >
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This archive was generated by hypermail 2.1.4 : Fri Jun 03 2005 - 10:11:56 GMT-3