Hi guys,
I am stumped by a multicast issue on one of my 6500 switches running
s72033-adventerprisek9-mz.151-2.SY11.bin code. Actually it is two 6500s
in VSS, but it should not matter, correct me if I am wrong.
The topology is fairly simple, a source is connected to one VLAN on
6500, then the receiver is on another VLAN on the same 6500. Both VLANs
are in the same VRF. Both VLANs are configured for PIM Sparse mode.
Multicast routing is enabled for the VRF. Relevant config:
vrf definition TEST
rd 65000:803
!
address-family ipv4
exit-address-family
!
ip multicast-routing
ip multicast-routing vrf TEST
!
ip pim vrf TEST rp-address 10.0.0.1
!
interface Vlan803
description SOURCE
vrf forwarding TEST
ip address 10.0.0.1 255.255.255.0
ip pim sparse-mode
arp timeout 300
!
interface Vlan804
description RECEIVER
vrf forwarding TEST
ip address 192.168.2.1 255.255.255.0
ip pim sparse-mode
load-interval 30
arp timeout 300
I see multicast routing entries in the mroute table for the VRF increasing:
sh ip mroute vrf TEST
...
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.192.2.196), 00:24:57/stopped, RP 10.0.0.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan804, Forward/Sparse, 00:24:57/00:02:40
(10.0.0.11, 239.192.2.196), 00:24:57/00:02:57, flags: T
Incoming interface: Vlan803, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan804, Forward/Sparse, 00:24:57/00:02:40, H
sh ip mroute vrf TEST count
IP Multicast Statistics
2 routes using 1102 bytes of memory
1 groups, 1.00 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: 239.192.2.196, Source count: 1, Packets forwarded: 1503, Packets
received: 1503
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.0.0.11/32, Forwarding: 1503/1/84/0, Other: 1503/0/0
sh ip mroute vrf TEST count
IP Multicast Statistics
2 routes using 1102 bytes of memory
1 groups, 1.00 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: 239.192.2.196, Source count: 1, Packets forwarded: 1510, Packets
received: 1510
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.0.0.11/32, Forwarding: 1510/1/84/0, Other: 1510/0/0
I am testing it by running ping on the source "ping -t 64
239.192.2.196". I see packets leaving the source as verified by tcpdump.
However packets are not making it to the receiver as verified by tcpdump.
Funny thing is that when I clear the mroute table on the switch by
issuing "clear ip mroute vrf TEST *" I receive EXACTLY ONE ping packet
on the receiver, then again nothing:
20:17:02.576050 IP 10.0.0.11 > 239.192.2.196: ICMP echo request, id
11724, seq 625, length 64
Any pointers would be greatly appreciated.
Best regards,
Jan Gregor
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