Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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Notes:
•
first-hop-router: The router that is connected directly to the multicast sender
•
last-hop-router: The router that is connected directly to the multicast receivers
(1) Items checked in common
The following table shows the items checked in common for all the Switches in an IPv4 PIM-SSM
network configuration.
Table 3-29: Items checked in common
No. Items to check and commands Action
1 Make sure that the setting for using the multicast
functionality (
ip multicast routing) exists in the
configuration.
show running-config
If the setting for using the multicast functionality does
not exist, modify the configuration.
2 For AX6700S, AX6600S, or AX6300S series switches,
make sure that the multicast protocol used in the
configuration is PIM-SM.
(ip multicast protocol pim-sm is specified or no
command is specified)
show running-config
If a protocol other than PIM-SM is specified for the
multicast protocol, modify the configuration.
In addition, if no multicast protocol is specified in the
configuration, PIM-SM is specified for the multicast
protocol to be used.
3 Make sure that PIM-SM is running on one or more
interfaces.
show ip pim interface
If PIM-SM is not running, check and modify the
configuration so that PIM-SM runs on at least one of
the interfaces. If the configuration contains the setting
for running PIM on an interface, but the interface is not
displayed by the
show ip pim command with the
interface parameter, make sure that multihoming is
not set for the target interface.
4 Check whether IGMP snooping is set for the interface
on which PIM runs.
show igmp-snooping
If IGMP snooping is set, check the following:
• Check whether the multicast router port for IGMP
snooping is set for the port connected to the
neighboring router.
• See 3.6.4 Multicast forwarding by IGMP
snooping is not possible.
5 Make sure that the configuration does not contain
filtering or other settings that suppress forwarding of
protocol packets and multicast packets on the interface
on which PIM and IGMP run.
show running-config
If the configuration contains a setting that suppresses
forwarding of protocol packets and multicast packets,
modify the configuration. For details about the
procedure for checking the filter configuration
information, see 3.25.1 Checking the filters and QoS
configuration information.
6 Check the PIM neighboring information.
show ip pim neighbor
If neighboring routers are not displayed, check the
following:
• Use the
show ip pim command with the
interface parameter to make sure that PIM is
running on the interface connected with the
neighboring routers.
• Check the settings of the neighboring routers.
7 Check whether the unicast route to the multicast data
sender exists.
show ip route
If the unicast route does not exist, see 3.8 IPv4 unicast
routing communication failures.
8 Make sure that PIM is running on the unicast route send
interface to the multicast data sender.
show ip pim interface
If PIM is not running, check and modify the
configuration so that PIM runs on the unicast route
send interface.