Interfaces are going into Suspended states on VSS 4500x switches

[saksingh]

Hi, 

I have a 4500X-16 VSS setup running IOS version 03.08.00E.

I'm using LACP to bundle interfaces, and each port channel consists of two interfaces—one from Switch 1 and one from Switch 2.

The issue is observed only on Switch 2, where the interfaces are going into a suspended state across all LACP-configured port channels. In contrast, switch 1 is not experiencing any problems; all interfaces are coming up as expected.

I also have two additional port channels configured in "on" mode (i.e., static EtherChannel), and they are working without any issues.

I've reviewed the interface configurations on both switches, and everything appears to be correctly set.

Is there a known bug affecting this IOS version, or are there further troubleshooting steps I can take to resolve this—ideally without having to reload the devices?

** I know IOS is older, Due to Airport network, it's difficult to reload the switches as its Distribution switch. ** 

[marce1000]

  - @saksingh   >....The issue is observed only on Switch 2, where the interfaces are going into a suspended state across all LACP-configured port
                                        Check the logs on the switch when that happens ,

  M.

[saksingh]

I have checked interfaces from both ends. One side speed is showing 10Gb/s and on the suspended port side it is showing Auto speed. Will this cause a problem.       (I had to manually shut the suspended port down to avoid any issue)

RACKJ-9200-48#sh interfaces te1/1/3
TenGigabitEthernet1/1/3 is down, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet, address is c4b2.39de.07b3 (bia c4b2.39de.07b3)
Description: AV60-OCC-RACKI-4500x-Stack
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 not set
Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 7w5d, output 7w5d, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
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
874964460 packets input, 148101508704 bytes, 0 no buffer
Received 111738721 broadcasts (36556641 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 36556641 multicast, 0 pause input
0 input packets with dribble condition detected
4685904355 packets output, 3973389298331 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
604636 unknown protocol drops
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

Suspended port:

-RACKI-4500x-Stack#sh interface te2/1/11
TenGigabitEthernet2/1/11 is administratively down, line protocol is down (disabled)
Hardware is Ten Gigabit Ethernet Port, address is 84b2.6137.dd8a (bia 84b2.6137.dd8a)
Description: AV60-OCC-RACKJ-9200-48
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, Auto-speed, link type is auto, media type is 10GBase-SR
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 7w5d, 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: 2
Queueing strategy: fifo
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
4685904347 packets input, 3973389298135 bytes, 0 no buffer
Received 26988373 broadcasts (13420067 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
874964457 packets output, 148101508504 bytes, 0 underruns
0 output errors, 0 collisions, 3 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

[saksingh]

The speed on one side is showing 10Gb/s and on the 4500 side it shows Auto-speed. Will this be a problem? 

[marce1000]

  - @saksingh   You will only be able to find that out if you follow the instructions from my initial reply,

  M.

[Leo Laohoo]

Post the complete output to the following commands: 

sh log
sh etherchan <PO #> summary

[saksingh]

AV60-OCC-RACKI-4500x-Stack#sh etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use N - not in use, no aggregation
f - failed to allocate aggregator

M - not in use, minimum links not met
m - not in use, port not aggregated due to minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

A - formed by Auto LAG

Number of channel-groups in use: 7
Number of aggregators: 7

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) - Te1/1/1(P) Te1/1/2(P)
2 Po2(SU) - Te2/1/1(P) Te2/1/2(P)
3 Po3(SU) LACP Te1/1/15(P) Te1/1/16(P) Te2/1/15(D)
Te2/1/16(D)
4 Po4(SU) LACP Te1/1/9(P) Te1/1/10(P) Te2/1/10(D)
6 Po6(SU) LACP Te1/1/12(P) Te2/1/12(w)
7 Po7(SU) LACP Te1/1/11(P) Te2/1/11(D)
8 Po8(SD) -

[Leo Laohoo]

Is it me or are the problem link(s) all seem to be situated with Switch 2, slot 5 (Supervisor) line card.

[saksingh]

The device is 4500x-16, which is pizza box, it is not a chassis, and the other side switches are 3850 and 9200.