Cisco Cisco 12000 Series 4-Port OC-12c STM-4c ATM Line Card Guía Para Resolver Problemas
In certain cases, DFC provides the capability to recirculate the packets. Recirculation can be used
to perform additional lookups in the ACL or QoS Ternary Content Addressable memory (TCAM),
the NetFlow table, or the Forwarding Information Base (FIB) TCAM table. Packet recirculation
occurs only on a particular packet flow; other packet flows are not affected. The rewrite of the
packet occurs on the modules; the packets are then forwarded back to the Policy Feature Card
(PFC) for additional processing.
to perform additional lookups in the ACL or QoS Ternary Content Addressable memory (TCAM),
the NetFlow table, or the Forwarding Information Base (FIB) TCAM table. Packet recirculation
occurs only on a particular packet flow; other packet flows are not affected. The rewrite of the
packet occurs on the modules; the packets are then forwarded back to the Policy Feature Card
(PFC) for additional processing.
When using a layer 2 DEC, packet recirculation at ingress module is required during Catalyst
6500 is running in flow-through mode along with 3B/3BXL PFC mode.
6500 is running in flow-through mode along with 3B/3BXL PFC mode.
Overrun counter can start incrementing when the fabric utilization reaches about 50%.
Troubleshoot & Verify
1) Find out the member interfaces in the Etherchannel experiencing incrementing overruns.
2) Verify input rate and overrun counters on member interfaces.
6500#show interfaces tenGigabitEthernet 2/1
TenGigabitEthernet2/1 is up, line protocol is up (connected)
Hardware is C6k 10000Mb 802.3, address is 0002.fcc1.21ac (bia 0002.fcc1.21ac)
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 251/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, media type is 10Gbase-SR
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:51, output hang never
Last clearing of "show interface" counters 00:00:13
Input queue: 0/2000/5597178/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 9868906000 bits/sec, 822409 packets/sec
30 second output rate 3000 bits/sec, 5 packets/sec
10968368 packets input, 16452552000 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 5597195 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
79 packets output, 5596 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
6500#show interfaces tenGigabitEthernet 2/2
TenGigabitEthernet2/2 is up, line protocol is up (connected)
Hardware is C6k 10000Mb 802.3, address is 0002.fcc1.21ad (bia 0002.fcc1.21ad)
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 251/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, media type is 10Gbase-SR