H3C S6300 Series Troubleshooting Manual page 26

TPKT.xe0
TMCA.xe0
TBYT.xe0
PERQ_PKT(3).xe0
PERQ_BYTE(3).xe0
As shown in the command output, multicast packet loss has occurred as indicated by the
statistics in the RDBGC2 field. If multicast packet loss statistics is displayed repeatedly
when you execute the command two or more times, collect statistics about packet loss
including the service module, port, and port settings and contact technical support.
2. Verify that packets are not mistakenly filtered out by ACLs:
a. Examine the ACL and QoS policy configurations for packet filtering on the port, on the VLAN
of the port, or globally. If packets are mistakenly filtered out, modify the ACL or QoS policy
configuration.
−
To display the ACL configuration on the port for packet filtering, execute the display
packet-filter command.
−
To display the QoS policy configuration on the port, execute the display qos policy
command.
−
To display the QoS policy configuration on the VLAN of the port, execute the display
qos vlan-policy command.
−
To display the global QoS policy configuration, execute the display qos policy
global command.
b. Verify that packets are not filtered out by automatically created ACLs.
The IP source guard feature creates ACLs automatically.
Execute the display this command in Ethernet interface view to verify that the ip
source binding or ip verify source command is configured on the port. To display
source guard binding entries, execute the display ip source binding or display
ipv6 source binding command. If IP source guard is configured but the packets match
no entry, further troubleshoot the issue based on the way the binding entries are created.
3. Verify that the port is not blocked:
Execute the display stp brief command to verify that STP does not set the state of the

port to discarding. When the port is in discarding state, it cannot forward traffic. H3C
recommends disabling STP on the port, or configuring the port as an edge port if the port is
connected to a terminal device.
If the port belongs to an aggregation group, execute the display link-aggregation

verbose command to identify the port status. When the port is an Unselected port, it
cannot forward traffic. Locate the reasons why the port is in Unselected state. For example,
the attribute configurations of the port are different from the configurations of the reference
port.
4. Examine the following configurations that might cause packet loss:
VLAN configuration—Execute the display this command in Ethernet interface view to

verify that the port is in the VLAN of the packets. If it is not, add the port to the VLAN.
Blackhole MAC address entries—Execute the display mac-address blackhole

command to display blackhole MAC address entries. If the packets are discarded because
they match a blackhole MAC address entry, delete the entry. To delete the blackhole MAC
address entry, execute the undo mac-address blackhole mac-address vlan
vlan-id command.
Rate limit—Execute the display qos lr interface command to display the rate limit

configuration on the port. If rate limit is configured on the port, make sure the committed
information rate (CIR) and the committed burst size (CBS) are appropriate. To adjust the
: 8,208
: 8,208
: 2,741,472
: 8,208
: 2,741,472
23
+8,208
+8,208
+2,741,472
+8,208
+2,741,472 330/s