From: miken (miken@sisna.com)
Date: Thu Jul 31 2003 - 04:00:17 GMT-3
Paul,
If you don't have an RP configured and use sparse-dense mode on the
interface, it uses dense mode. That is why you are able to ping when you
removed the RP configuration. Were you able to ping the RP from the switch?
Check your layer 3 connectivity and try it again. The "Incoming interface:
Null, RPF nbr 0.0.0.0" may be the hint.
HTH,
Mike N.
----- Original Message -----
From: "Paul Chen" <cpjchen@starhub.net.sg>
To: <ccielab@groupstudy.com>
Sent: Thursday, July 31, 2003 12:33 AM
Subject: Cat 3550 - Multicast problems
> Hi Everyone,
>
> Appreciate any help from anyone on this problem.
>
> The lab requirement is to configure vlan 50, 60 for multicast routing
> with the catalyst switch.
>
> Configs are show below:
>
> Q1. How do you go about configuring multicast routing for the cat 3550
> ? Are my configs correct
>
> Q2. Do you use igmp snooping since cgmp is not supported ? you can
> configure igmp snooping only in global config mode
>
> Q3. Why can't I ping 224.100.100.100 from the Cat 3550s if the rp
> address is configured ? If you remove the rp address you
> will no longer see it in 'sh ip mroute' , however you can ping
> 224.100.100.100 ?
>
> --------------------------------------------------------------------------
--------------------------------------------
>
> R4 is the static RP - 150.50.4.4 , RPs configured on R8, R7,R2,R1 , CAT
> 3550-1, CAT3550-2
>
> R2 is a member of the multicast group 224.100.100.100
>
> R7
> ||
> vlan trunking for vlan 50,60
> ||
> Cat 3550-2 ----------etherchannel ---------- Cat3550-1
>
>
>
> On R7
> --------------------------------------------------------------------------
-----------------------------------------
>
> > interface Ethernet1/0.50
> > encapsulation dot1q 50
> > ip address 150.50.50.7 255.255.255.0
> > ip router isis
> > ip pim sparse-mode
> > ip rsvp bandwidth 128 128
> > !
> > interface Ethernet1/0.60
> > encapsulation dot1q 60
> > ip address 150.50.60.7 255.255.255.0
> > ip router isis
> > ip pim sparse-mode
>
>
>
> r7#sh ip mroute
> 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
>
> (*, 224.0.1.40), 01:41:01/00:02:51, RP 150.50.4.4, flags: SJCL
> Incoming interface: FastEthernet0/0.50, RPF nbr 150.50.50.5
> Outgoing interface list:
> Serial0/0, Forward/Sparse-Dense, 00:10:38/00:02:51
>
> (*, 224.100.100.100), 00:44:02/00:02:04, RP 150.50.4.4, flags: SJPC
> Incoming interface: FastEthernet0/0.50, RPF nbr 150.50.50.5
> Outgoing interface list: Null
>
> r7# sh ip pim rp
> Group: 224.0.1.40, RP: 150.50.4.4, uptime 00:04:40, expires never
> Group: 224.100.100.100, RP: 150.50.4.4, uptime 00:04:40, expires
>
> r7#ping 224.100.100.100
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.100.100.100, timeout is 2 seconds:
>
> Reply to request 0 from 150.50.100.2, 177 ms
> Reply to request 0 from 150.50.100.2, 197 ms
>
>
>
> On Cat
>
3550-2:---------------------------------------------------------------------
--------------------------------
>
> interface FastEthernet0/6
> switchport access vlan 60
> switchport mode access
> no ip address
> !
> interface FastEthernet0/7
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 50,60,1002-1005
> switchport mode trunk
>
> interface Vlan50
> ip address 150.50.50.50 255.255.255.0
> ip pim sparse-dense-mode
> ip igmp join-group 224.100.100.100 --------- YOU CAN'T DO THIS IN
> INTERFACE MODE ONLY INT VLAN
> !
> interface Vlan60
> ip address 150.50.60.60 255.255.255.0
> ip pim sparse-dense-mode
> ip igmp join-group 224.100.100.100
>
> ip pim rp-address 150.50.4.4
>
>
> cat3550-2# sh ip igmp groups
> IGMP Connected Group Membership
> Group Address Interface Uptime Expires Last
Reporter
> 224.100.100.100 Vlan60 00:56:12 00:02:15 150.50.60.60
> 224.100.100.100 Vlan50 00:56:17 00:02:19 150.50.50.51
> 224.0.1.40 Vlan50 00:40:47 00:02:17 150.50.50.7
>
>
> cat3550-2#ping 224.100.100.100 ------------------ > you can't ping this
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.100.100.100, timeout is 2 seconds:
> .
> cat3550-2#sh ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, 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 - Advertised via MSDP, U - URD, I - Received Source Specific Host
> Report
> Outgoing interface flags: H - Hardware switched
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 224.0.1.40), 00:41:00/00:02:05, RP 150.50.4.4, flags: SJPCL
> Incoming interface: Null, RPF nbr 0.0.0.0 --------------------->
> Can't see neighbor ?
> Outgoing interface list: Null
>
> (*, 224.100.100.100), 00:40:58/00:02:06, RP 150.50.4.4, flags: SJCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Vlan60, Forward/Sparse-Dense, 00:40:53/00:02:02
>
> cat3550-2#ping 224.100.100.100
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.100.100.100, timeout is 2 seconds:
> .
> cat3550-2#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
>
>
> cat3550-2(config)#no ip pim rp-address 150.50.4.4 -----------> after
> you remove the rp address, you can ping 224.100.100.100 ? Why ?
>
> cat3550-2#ping 224.100.100.100
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.100.100.100, timeout is 2 seconds:
>
> Reply to request 0 from 150.50.50.50, 4 ms
> Reply to request 0 from 150.50.60.60, 4 ms
>
>
> NOW YOU CAN'T SEE THE RP ANYMORE
>
> cat3550-2#sh ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, 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 - Advertised via MSDP, U - URD, I - Received Source Specific Host
> Report
> Outgoing interface flags: H - Hardware switched
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 224.0.1.40), 00:00:17/00:02:42, RP 0.0.0.0, flags: DJCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Vlan60, Forward/Sparse-Dense, 00:00:17/00:00:00
> Vlan50, Forward/Sparse-Dense, 00:00:17/00:00:00
>
> (*, 224.100.100.100), 00:00:17/stopped, RP 0.0.0.0, flags: DJCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Vlan60, Forward/Sparse-Dense, 00:00:17/00:00:00
> Vlan50, Forward/Sparse-Dense, 00:00:17/00:00:00
>
> (150.50.50.50, 224.100.100.100), 00:00:10/00:02:49, flags: LT
> Incoming interface: Vlan50, RPF nbr 0.0.0.0
> Outgoing interface list:
> Vlan60, Forward/Sparse-Dense, 00:00:14/00:00:00, H
>
> (150.50.60.60, 224.100.100.100), 00:00:14/00:02:45, flags: LT
> Incoming interface: Vlan60, RPF nbr 0.0.0.0
> Outgoing interface list:
> Vlan50, Forward/Sparse-Dense, 00:00:14/00:00:00, H
>
> cat3550-2#ping 224.100.100.100
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.100.100.100, timeout is 2 seconds:
>
> Reply to request 0 from 150.50.50.50, 4 ms
> Reply to request 0 from 150.50.60.60, 4 ms
> cat3550-2#
>
>
> cat3550-2#sh ip igmp snooping
> vlan 1
> ----------
> IGMP snooping is globally enabled
> IGMP snooping is enabled on this Vlan
> IGMP snooping immediate-leave is disabled on this Vlan
> IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
> IGMP snooping is running in IGMP_ONLY mode on this Vlan
> vlan 11
> ----------
> IGMP snooping is globally enabled
> IGMP snooping is enabled on this Vlan
> IGMP snooping immediate-leave is disabled on this Vlan
> IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
> IGMP snooping is running in IGMP_ONLY mode on this Vlan
> vlan 50
> ----------
> IGMP snooping is globally enabled
> IGMP snooping is enabled on this Vlan
> IGMP snooping immediate-leave is disabled on this Vlan
> IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
> IGMP snooping is running in IGMP_ONLY mode on this Vlan
> vlan 60
> ----------
> IGMP snooping is globally enabled
> IGMP snooping is enabled on this Vlan
> IGMP snooping immediate-leave is disabled on this Vlan
> IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
> IGMP snooping is running in IGMP_ONLY mode on this Vlan
>
>
>
>
>
>
>
> On Cat
>
3550-1----------------------------------------------------------------------
------------------------------
>
> interface FastEthernet0/5
> switchport access vlan 50
> switchport mode access
> no ip address
>
> interface Vlan50
> ip address 150.50.50.51 255.255.255.0
> ip pim sparse-dense-mode
> ip igmp join-group 224.100.100.100
>
> ip pim rp-address 150.50.4.4
>
> Same results - after removing the rp address you can ping
> 224.100.100.100 but can no longer see the rp in show ip mroute.
>
> --------------------------------------------------------------------------
---------------------------------------
>
>
> Questions again : --
>
>
> The lab requirement is to configure vlan 50, 60 for multicast routing
> with the catalyst switch.
>
> Q1. How do you go about configuring multicast routing for the cat 3550
> ? Are my configs correct
>
> Q2. Do you use igmp snooping since cgmp is not supported ? you can
> configure igmp snooping only in global config mode
>
> Q3. Why can't I ping 224.100.100.100 from the Cat 3550s if the rp
> address is configured ? If you remove the rp address you
> will no longer see it in 'sh ip mroute' , however you can ping
> 224.100.100.100 ?
>
>
> Thanks,
> Paul
>
>
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This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:59 GMT-3