Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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(4) Items to check for last-hop-router
The following table shows the items to check when the Switch is used as
last-hop-router in an
IPv4 PIM-SM network configuration.
Table 3-26: Items to check for last-hop-router
(5) Items to check for first-hop-router
The following table shows the items to check when the Switch is used as
first-hop-router in an
IPv4 PIM-SM network configuration.
2 Make sure the Switch is the rendezvous point for the
forwarding target group address.
show ip pim rp-hash <Group Address>
If the Switch is not the rendezvous point, check the
priorities of other rendezvous point candidates. A
smaller value represents a higher priority. If the
priority of another rendezvous point candidate is
higher than that of the Switch, the Switch does not
work as the rendezvous point. If the priority is the
same between another candidate and the Switch, they
are assigned to a different group address due to the
protocol specification, and the Switch might not work
as the rendezvous point for the target group. If you
want to use the Switch as the rendezvous point, set a
higher priority for the Switch than other rendezvous
point candidates.
No. Items to check and commands Action
1 Make sure that IGMP is running on the interface
connected to the multicast receivers.
show ip igmp interface
If IGMP is not running, check and modify the
configuration so that IGMP runs on the interface.
2 Make sure that the multicast receivers participate in the
forwarding target group through IGMP.
show ip igmp group
If a multicast receiver does not participate in the
forwarding target group, check the multicast receiver
settings.
3 If the interface in which the forwarding target group
participates exists, make sure that the Switch is DR.
show ip pim interface
If the Switch is not DR, check the DR of the
forwarding target interface.
4 Check whether IGMP snooping is set for the interface
on which the static group participation functionality is
used.
show igmp-snooping
If IGMP snooping is set, check the following:
• Check whether the multicast router port for IGMP
snooping is set for the destination port.
• See 3.6.4 Multicast forwarding by IGMP
snooping is not possible.
5 Check whether any anomaly has been detected on any
interface.
show ip igmp interface
Make sure that no warning information is displayed for
Notice.
If warning information is displayed, check the
following:
•
L: More participation requests than the expected
maximum number have occurred. Check the
number of connected users.
•
Q: The IGMP version is different from that on the
neighboring router. Use the same IGMP version.
•
R: A user is sending a report that cannot be
received with the current settings. Change the
IGMP version on the Switch, or check the settings
of the participation user.
No. Items to check and commands Action