From: William Chen (kwchen@netvigator.com)
Date: Thu Apr 15 2004 - 09:22:36 GMT-3
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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