Troubleshooting guide

11-48
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 11 Troubleshooting Layer 3 Network Connections
Troubleshooting Layer 3 IP Multicast Switching
Step 2 Check the following:
• Status field to ensure that the Broute VC is up.
• IP routing field to ensure that it is on.
• IP Multicast field to ensure that it is enabled.
If you have any problems with these fields, check the interface configuration. For information about
configuring interfaces, refer to the Layer 3 Software Feature and Configuration Guide.
Step 3 Display the IP multicast entries contained in the route processor using the show ip mroute command.
C8540CSR-1# 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
Outgoing Interface Flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.2.236.92), 00:58:34/00:03:09, RP 10.6.11.10, flags: S
Incoming interface: POS12/0/0, RPF nbr 10.6.11.10
Outgoing interface list:
FastEthernet3/0/13, Forward/Sparse, 00:57:56/00:03:09
FastEthernet2/0/15, Forward/Sparse, 00:58:13/00:02:53
(10.64.1.19, 224.2.236.92), 00:58:13/00:03:22, flags: T
Incoming interface: POS12/0/0, RPF nbr 10.6.11.10
Outgoing interface list:
FastEthernet3/0/13, Forward/Sparse, 00:57:56/00:03:08
FastEthernet2/0/15, Forward/Sparse, 00:58:13/00:02:53
Step 4 Use the address and interface information from the show ip mroute command output in Step 3 to
display the CAM information with the show epc ipmcast command.
C8540CSR-1# show epc ipmcast 224.2.236.92 10.64.1.19 detail interface pos 12/0/0
MEMBER_ENTRY, root vc = 0/801, packet counter = 47
(224.2.236.92, 10.64.1.19), CAM Loc 0x17102, 00 34 48 00 00 2F 32 11
Send_to_cpu flag not set, SPT flag set
p2mp vc:root POS12/0/0, VPI = 0, VCI = 801
leaf FastEthernet2/0/15, VPI = 0, VCI = 762
FastEthernet3/0/13, VPI = 0, VCI = 751
Step 5 Check the following:
• Multicast group 224.2.236.92 and source 10.64.1.19 has a CAM entry on interface POS 12/0/0.
• The Send_to_cpu flag is appropriately not set for a specified source (S, G) within a group indicating
that the traffic is switched in the data plane by the interface. The Send_to_cpu flag is set for table
entries for all sources within a group (*, G) to maintain the state for this entry on the control plane.
Step 6 Display the status of the VC for the incoming interface displayed in the show ip mroute command
output in Step 3 using the show atm vc cast-type p2mp interface command.
C8540CSR-1# show atm vc cast-type p2mp interface pos 12/0/0
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
.
(Information deleted)
.
POS12/0/0 0 801 PVC Fa2/0/15 0 762 UP