VSL link port channel one interface isnt' coming up.

[gavin han]

what could be the issue? one of the interface of each port-channel isn't coming up.

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) - Te1/1/10(w) Te1/3/11(P)
2 Po2(SU) - Te2/2/10(w) Te2/4/11(P)

sw-vss#sh int Te1/1/10
TenGigabitEthernet1/1/10 is up, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet Port, address is e865.4902.5f80 (bia e865.4902.5f80)
MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LRM
input flow-control is on, output flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 72
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1637642 packets input, 139806274 bytes, 0 no buffer
Received 146194 broadcasts (146194 multicasts)
0 runts, 0 giants, 0 throttles
1820 input errors, 1763 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
2041601 packets output, 172098771 bytes, 0 underruns
0 output errors, 0 collisions, 14753 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
sw-vss#sh int Te2/2/10
TenGigabitEthernet2/2/10 is up, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet Port, address is 54a2.741e.6180 (bia 54a2.741e.6180)
MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LRM
input flow-control is on, output flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 10d05h, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 158
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 8000 bits/sec, 12 packets/sec
17141863 packets input, 1457120977 bytes, 0 no buffer
Received 1522981 broadcasts (1522981 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
17405487 packets output, 1485468989 bytes, 0 underruns
0 output errors, 0 collisions, 16833 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
sw-vss#

[Reza Sharifi]

Do these interfaces work fine when they are not part of the VSL Portchannels?

[Moh Mogh]

Hi,

I'm more suspicious of a Layer 1 issue. Check the transceivers and the links between chassis. To rule out some possibilities, you can try swapping the transceivers, swapping the ports, etc.

Also a show run of the VSS configuration would be helpful to make sure that there is no configuration conflicts.

Regards,
Mohammad Moghaddas

[InayathUlla Sharieff]

"W"- means waiting to get aggregated or negotiation taking place.

Could you please check if your layer 1 is good? Change the cable/port and check if the port comes up?

Regards

Inayath

[rakeshvelagala]

Hi 

I came across same problem once and wasted an hour. One of the transceivers mostly is faulty.

Thanks