From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Sun Nov 05 2000 - 22:10:50 GMT-3
Hazel,
224.0.1.39 and 224.0.1.40 are part of the multicast implementation
itself, nothing to worry about. 224.0.1.40 is cisco-rp-discovery. Here's
a brief description:
<snip>
The RP mapping agents advertise the authoritative RP-mappings to another
well-known group address 224.0.1.40 (CISCO-RP-DISCOVERY). All PIM routers
join 224.0.1.40 and store the RP-mappings in their private cache.
<end snip>
Brian
On Sun, 5 Nov 2000, Hazel Gachoka wrote:
> I am configuring mulitcast and specifying that r1 should only join group 224.
1.2.3, however, despite using an igmp access-goup permiting only one gorup, 224
.0.1.40 is still permitted. Can anyone see why?
> Here is a copy of the show tech ipmulticast:
>
> Hazel
>
> Building configuration...
>
> Current configuration:
> !
> version 12.0
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname r1
> !
> !
> ip subnet-zero
> no ip domain-lookup
> ip multicast-routing
> ip dvmrp route-limit 20000
> !
> !
> !
>
> interface Serial1
> ip address 137.2.128.1 255.255.255.0
> no ip directed-broadcast
> ip pim sparse-mode
> ip igmp join-group 224.1.2.3
> ip igmp access-group 1
> clockrate 2000000
> !
> no ip classless
> ip pim rp-address 137.2.5.5
> !
> access-list 1 permit 224.1.2.3
> !
> line con 0
> transport input none
> line aux 0
> line vty 0 4
> login
> !
> end
>
> ------------------ show ip pim interface ------------------
>
>
>
> Address Interface Version/Mode Nbr Query DR
> Count Intvl
> 137.2.128.1 Serial1 v2/Sparse 1 30 0.0.0.0
>
> ------------------ show ip pim interface count ------------------
>
>
>
> Address Interface FS Mpackets In/Out
> 137.2.128.1 Serial1 * 174/0
>
> ------------------ show ip pim neighbor ------------------
>
> PIM Neighbor Table
> Neighbor Address Interface Uptime Expires Ver Mode
> 137.2.128.5 Serial1 00:49:21 00:01:16 v1 Sparse
>
> ------------------ show ip pim rp ------------------
>
>
> Group: 224.0.1.40, RP: 137.2.5.5, v1, uptime 00:00:12, expires never
> Group: 224.1.2.3, RP: 137.2.5.5, uptime 00:00:12, expires never
>
> ------------------ show ip igmp groups ------------------
>
>
> IGMP Connected Group Membership
> Group Address Interface Uptime Expires Last Reporter
> 224.0.1.40 Serial1 00:49:33 never 0.0.0.0
> 224.1.2.3 Serial1 01:18:53 never 0.0.0.0
>
> ------------------ show ip igmp interface ------------------
>
> Serial1 is up, line protocol is up
> Internet address is 137.2.128.1/24
> IGMP is enabled on interface
> Current IGMP version is 2
> CGMP is disabled on interface
> IGMP query interval is 60 seconds
> IGMP querier timeout is 120 seconds
> IGMP max query response time is 10 seconds
> Last member query response interval is 1000 ms
> Inbound IGMP access group is 1
> IGMP activity: 4 joins, 2 leaves
> Multicast routing is enabled on interface
> Multicast TTL threshold is 0
> Multicast groups joined: 224.1.2.3 224.0.1.40
> ------------------ show ip mroute count ------------------
>
> IP Multicast Statistics
> 2 routes using 692 bytes of memory
> 2 groups, 0.00 average sources per group
> Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
> Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
>
> Group: 224.0.1.40, Source count: 0, Group pkt count: 0
>
> Group: 224.1.2.3, Source count: 0, Group pkt count: 0
>
> ------------------ show ip mroute ------------------
>
>
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
> R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT
> X - Proxy Join Timer Running
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 224.0.1.40), 01:18:49/00:00:00, RP 137.2.5.5, flags: SJPCL
> Incoming interface: Serial1, RPF nbr 137.2.128.5
> Outgoing interface list: Null
>
> (*, 224.1.2.3), 00:51:55/00:00:00, RP 137.2.5.5, flags: SJPCL
> Incoming interface: Serial1, RPF nbr 137.2.128.5
> Outgoing interface list: Null
>
> r1#ping 224.1.2.3
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.1.2.3, timeout is 2 seconds:
>
> Reply to request 0 from 137.2.128.5, 8 ms
> Reply to request 0 from 137.2.80.6, 16 ms
> r1#ping 224.0.1.40
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.0.1.40, timeout is 2 seconds:
> .
>
>
>
>
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