From: Yasser Abdullah (yasser@alharbitelecom.com)
Date: Thu Apr 15 2004 - 11:51:35 GMT-3
A tunnel is needed per spoke. You could also use a p2p subinterface.
This only applies for dense-mode multicast.
Yasser
-----Original Message-----
From: Mark Rushby [mailto:mark@tisolutions.biz]
Sent: Thursday, April 15, 2004 5:42 PM
To: Yasser Abdullah
Subject: RE: ip pim nbma-mode
Hi
Do you use a single gre tunnel to one spoke or a tunnel per spoke? I'm
just starting to study multicast so please excuse the simple question
Thanks
mark
-----Original Message-----
From: Yasser Abdullah [mailto:yasser@alharbitelecom.com]
Sent: 15 April 2004 13:54
To: 'William Chen'
Cc: ccielab@groupstudy.com
Subject: RE: ip pim nbma-mode
No, that's not what NBMA is for. It's used to configure a hub router to
send the multicast packet to ONLY the spoke that requested it. For split
horizon issues just use a GRE tunnel.
HTH,
Yasser
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
William Chen
Sent: Thursday, April 15, 2004 3:23 PM
To:
Subject: ip pim nbma-mode
Dear all,
Anyone confirm me that the command "ip pim nbma-mode" command is able
to solve the multicast split horizon problem (i.e if the Hub received
multicast packets from one of the spoken will forward to another spoken,
if this command is turn on).
Following is an example:
Spoken (R1):
Rack1R1#sh run int s0/0.1
Building configuration...
Current configuration : 188 bytes
!
interface Serial0/0.1 point-to-point
ip address 141.1.123.1 255.255.255.0
ip pim sparse-mode
ip ospf network non-broadcast
ip ospf priority 0
frame-relay interface-dlci 102
end
Spoken (R3):
Rack1R3#sh run int s1/0.1
Building configuration...
Current configuration : 188 bytes
!
interface Serial1/0.1 point-to-point
ip address 141.1.123.3 255.255.255.0
ip pim sparse-mode
ip ospf network non-broadcast
ip ospf priority 0
frame-relay interface-dlci 302
end
Hub (R2):
Rack1R2#sh run int s0/0
Building configuration...
Current configuration : 360 bytes
!
interface Serial0/0
ip address 141.1.123.2 255.255.255.0
ip pim dr-priority 100
ip pim nbma-mode
ip pim sparse-mode
encapsulation frame-relay
ip ospf priority 100
frame-relay map ip 141.1.123.1 201 broadcast
frame-relay map ip 141.1.123.2 201
frame-relay map ip 141.1.123.3 203 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
end
Verfication:
Rack1R1#p
Protocol [ip]:
Target IP address: 239.39.39.39
Repeat count [1]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Interface [All]: Serial0/0.1
Time to live [255]:
Source address: 141.1.123.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 239.39.39.39, timeout is 2 seconds:
Packet sent with a source address of 141.1.123.1
Reply to request 0 from 141.1.123.3, 164 ms
Rack1R2#sh ip mroute 239.39.39.39
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C -
Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP
Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast
Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group Outgoing
interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.39.39.39), 03:30:17/stopped, RP 150.1.5.5, flags: SF
Incoming interface: Ethernet0/0, RPF nbr 141.1.0.5, Mroute
Outgoing interface list:
Serial0/0, 141.1.123.3, Forward/Sparse, 03:30:17/00:03:18
(141.1.123.1, 239.39.39.39), 00:00:18/00:03:18, flags: FT
Incoming interface: Serial0/0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, 141.1.123.3, Forward/Sparse, 00:00:18/00:03:18
Rack1R1#sh ver | in IOS
IOS (tm) C2600 Software (C2600-JK9O3S-M), Version 12.2(15)T9, RELEASE
SOFTWARE (fc2) Rack1R2#sh ver | in IOS IOS (tm) C2600 Software
(C2600-J1S3-M), Version 12.2(15)T5, RELEASE SOFTWARE (fc1) Rack1R3#sh
ver | in IOS IOS (tm) C2600 Software (C2600-J1S3-M), Version 12.2(15)T5,
RELEASE SOFTWARE (fc1)
Best Regards,
William Chen
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