Run the display current-configuration configuration pim command on the device that is
directly connected to the hosts to check the current configurations in the PIM view. If the
command output contains ssm-policy basic-acl-number or ssm-policy acl-name, it indicates
that the SSM group address range is defined on the device. Then, run the display acl { acl-
number | name acl-name } command to check the ACL configurations.
l If the command output shows that the multicast group G is in the address range permitted
by the ACL, it indicates that G belongs to the SSM group address range. Ensure that
IGMPv3 is running between the host and the interface of the device.
If the version of IGMP running on the host cannot be upgraded, you need to enable SSM
mapping on the interface of the device and create static SSM mapping rules for G.
l If the command output shows that the multicast group G is in the address range denied by
the ACL, it indicates that G belongs to the ASM group address range. Then, you need to
adjust the group address range specified in the ACL so that G is in the address range
permitted by the ACL.
l If the multicast group G is not in the SSM address range and the configured IGMP version
is correct, go to Step 5.
Step 5 Check whether the range of groups that the hosts cannot join is limited on the interface.
Run the display igmp interface interface-type interface-number command to check the current
configurations of the interface that is directly connected with the hosts.
l If the group-policy field in the command output is not none, it indicates that the range of
groups the hosts can join is limited on the interface. IGMP then filters Report or Join
messages of the hosts according to the ACL. Check the range of the groups permitted by
the ACL. If the multicast group G is not in this range, modify the ACL or delete the ACL
configuration to ensure that IGMP can serve members of G.
l If the range of groups that the hosts can join is not limited on the interface, go to Step 6.
Step 6 Check whether the maximum number of IGMP group memberships is limited on the interface.
Run the display igmp interface interface-type interface-number command to check the current
configurations of the interface that is directly connected with the hosts.
l If the IGMP limit field in the command output does not display -, it indicates that the
maximum number of IGMP group memberships is limited on the interface. Then, run the
igmp limit number command to increase the IGMP limit, or run the undo igmp limit
command to delete the configured IGMP limit.
l If the IGMP limit field in the command output displays -, go to Step 7.
Step 7 Check whether the maximum number of IGMP group memberships is limited in the current
instance.
Run the display current-configuration configuration igmp command to check the
configurations of the IGMP limit in the current instance.
l If the command output contains the configurations of the IGMP limit for the instance, it
indicates that the maximum number of IGMP group memberships is limited in this instance.
Then, run the limit number command in the IGMP view of the instance to increase the
IGMP limit, or run the undo limit command in the IGMP view of the instance to delete
the configured IGMP limit.
l If the command output does not contain the configurations of the IGMP limit for the
instance, go to Step 8.
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 8 Multicast
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
229
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