RE: ip ospf network point-to-multipoint

From: Victor Cappuccio (vcappuccio@desca.com)
Date: Mon Nov 13 2006 - 21:40:03 ART

Upps sorry and also the show runn of the OSPF process at the hub and
spokes

Thanks

Sorry for the Spam

________________________________

From: Victor Cappuccio
Sent: Lunes, 13 de Noviembre de 2006 08:38 p.m.
To: 'Kal Han'
Cc: Cisco certification; ccielab
Subject: RE: ip ospf network point-to-multipoint

Yes do you mind to show the running of one of the spokes please

________________________________

From: Kal Han [mailto:calikali2006@gmail.com]
Sent: Lunes, 13 de Noviembre de 2006 08:31 p.m.
To: Victor Cappuccio
Cc: Cisco certification; ccielab
Subject: Re: ip ospf network point-to-multipoint

Thanks Victor.

I am using the broadcast network... as shown below

R5#sh run int s0/0
Building configuration...

Current configuration : 480 bytes
!
interface Serial0/0
 ip address 195.3.56.5 255.255.255.0
 ip access-group 102 in
 ip access-group 101 out
 ip inspect idsin in
 ip inspect ids out
 encapsulation frame-relay
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 cciesec
 ip ospf network point-to-multipoint
 frame-relay map ip 195.3.56.3 503 broadcast
 frame-relay map ip 195.3.56.6 506 broadcast
 no frame-relay inverse-arp
 frame-relay lmi-type cisco
 crypto ipsec client ezvpn myezvpn
end

and if I look at the inbound access-list, you will notice that

both the host-to-host and host-to-ospf_multicast address have hit
counts.

Can you please let me know why this is so ?

R5#sh access-li 102
Extended IP access list 102
    1 permit ospf host 195.3.56.3 host 195.3.56.5 (178 matches)
    2 permit ospf host 195.3.56.6 host 195.3.56.5 (204 matches)
    5 permit udp host 195.3.56.3 host 195.3.56.5 eq ntp (412 matches)
    10 permit tcp any host 195.1.5.25 eq www
    20 permit tcp any host 195.1.5.25 eq 443
    30 permit udp host 195.1.114.4 host 195.3.56.5 eq isakmp (24
matches)
    40 permit udp host 195.1.114.4 host 195.3.56.5 eq non500-isakmp
    50 permit esp host 195.1.114.4 host 195.3.56.5 (32 matches)
    60 permit ospf host 195.3.56.3 host 224.0.0.9
    70 permit ospf host 195.3.56.3 host 224.0.0.5 (477 matches)
    80 permit ospf host 195.3.56.6 host 224.0.0.5 (476 matches)
    90 deny ip any any log (192 matches)

Thanks

Kal

On 11/13/06, Victor Cappuccio <vcappuccio@desca.com> wrote:

Hi Kal, this is very well explained in the Internetwork Experts CODs.

Frame-relay is NBMA as you stated, but you can add support to use
broadcast using the frame-relay map ip x.x.x.x DLCI broadcast if the SP
Equipment allows that off course.

Now the point-to-multipoint is used to low the number of frame-relay map
needed at the spokes because this network type would create a /32 of
every router in the frame-relay cloud

There is a ospf network type named ip ospf point-to-multipoint
nonbroadcast, that u use when you do not have broadcast capabilities in
the NBMA Cloud
(in this case you need to specify the neighbors because you are not
multicasting (broadcast) traffic out those interfaces)

http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_feature_

guide09186a0080087d4e.html#xtocid272779

Saludos,
Victor.-

-----Original Message-----
From: nobody@groupstudy.com [mailto: nobody@groupstudy.com
<mailto:nobody@groupstudy.com> ] On Behalf Of
Kal Han
Sent: Lunes, 13 de Noviembre de 2006 08:03 p.m.
To: Cisco certification; ccielab
Subject: ip ospf network point-to-multipoint

Hi
when I use the ip ospf network point-to-multipoint command,
on a point to multipoint serial interface ,
will the neighbors talk using multicast ospf messages or
do they unicast ?
How will the neighbor relationship come up ?
I understand this is NBMA but I didnt understand how it will
use the unicast messages.
Will it get the neighbor IP based on "frame-relay map ip"
command we configure ?
Its just confusing !

Thanks
Kal

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