Port Channel Issue

[rajaram855]

Only i have issues with the port channel 8,9 & 10, all the rest port channels are working perferct. i raised a cisco tag too. 

7 Po7(SU) LACP Gi1/0/25(P) Gi2/0/25(P)
8 Po8(SU) LACP Gi1/0/18(P) Gi2/0/18(s)
9 Po9(SU) LACP Gi1/0/19(P) Gi2/0/19(s)
10 Po10(SU) LACP Gi1/0/20(s) Gi2/0/20(P)

CoreSW#sh cable-diagnostics tdr interface gigabitEthernet 1/0/18
TDR test last run on: July 17 04:15:19

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/18 1000M Pair A 62 +/- 10 meters Pair A Normal
Pair B 62 +/- 10 meters Pair B Normal
Pair C 62 +/- 10 meters Pair C Normal
Pair D 62 +/- 10 meters Pair D Normal
CoreSW#sh cable-diagnostics tdr interface gigabitEthernet 2/0/18
TDR test last run on: July 17 04:16:13

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi2/0/18 100M Pair A 0 +/- 1 meters Pair B Normal
Pair B 0 +/- 1 meters Pair A Normal
Pair C 0 +/- 1 meters N/A Normal
Pair D 0 +/- 1 meters N/A Open
CoreSW#sh cable-diagnostics tdr interface gigabitEthernet 1/0/20
TDR test last run on: July 17 04:18:15

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/20 100M Pair A 0 +/- 1 meters Pair B Normal
Pair B 0 +/- 1 meters Pair A Normal
Pair C 0 +/- 1 meters N/A Normal
Pair D 0 +/- 1 meters N/A Normal
CoreSW#sh cable-diagnostics tdr interface gigabitEthernet 2/0/20
TDR test last run on: July 17 04:18:21

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi2/0/20 1000M Pair A 111 +/- 10 meters Pair B Normal
Pair B 111 +/- 10 meters Pair A Normal
Pair C 111 +/- 10 meters Pair D Normal
Pair D 111 +/- 10 meters Pair C Normal

[M02@rt37 · Accepted solution]

Hello @rajaram855,

Your TDR confirm faults on Gi2/0/18 (pair D) and Gi1/0/20 is noted with 100Mbps speed..whereas Gi2/0/20 is 1000Mbps.

So replace Rj45 cable on port Gi2/0/18 and check config on port Gi1/0/20: speed/duplex mismatch or auto-negotiation issue ? Check this please.

[rajaram855]

 check config on port Gi1/0/20: speed/duplex mismatch or auto-negotiation issue ?

 CoreSW#sh interfaces gi1/0/20
GigabitEthernet1/0/20 is up, line protocol is down (suspended)
Hardware is Gigabit Ethernet, address is 6c03.b5c4.b314 (bia 6c03.b5c4.b314)
Description: EV-Office-3
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:19, output 00:00:16, 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
2560841427 packets input, 2901622003072 bytes, 0 no buffer
Received 1712888 broadcasts (1648897 multicasts)
0 runts, 0 giants, 0 throttles
11 input errors, 9 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1648897 multicast, 0 pause input
0 input packets with dribble condition detected
1609582562 packets output, 120220372299 bytes, 0 underruns
Output 16825293 broadcasts (12905933 multicasts)
0 output errors, 0 collisions, 3 interface resets
52 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

CoreSW#sh interfaces gi2/0/20
GigabitEthernet2/0/20 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 6c03.b5e5.8c94 (bia 6c03.b5e5.8c94)

MTU 1500 bytes, BW 1000000 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, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:04, output 00:00:00, 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 6448000 bits/sec, 705 packets/sec
5 minute output rate 162000 bits/sec, 268 packets/sec
8955841532 packets input, 10372963414825 bytes, 0 no buffer
Received 10195768 broadcasts (9923881 multicasts)
2 runts, 0 giants, 0 throttles
6 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 9923881 multicast, 0 pause input
0 input packets with dribble condition detected
2717867453 packets output, 212656995904 bytes, 0 underruns
Output 36148982 broadcasts (89842685 multicasts)
0 output errors, 0 collisions, 2 interface resets
18 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

[M02@rt37]

@rajaram855 

Please test Gi1/0/20 port with a known-good cable or patch directly to a laptop to confirm it can do 1Gbps.

Also, verify both cable runs from Gi1/0/20 and Gi2/0/20, because 1meter from Gi1/0/20 is strange regarding 111 meters cable from Gi2/0/20....

[Leo Laohoo]

Gi 2/0/20 is, potentially, >100 metres but Gi 1/0/20 is a 1 metre cable?  

Yeah, something smells really fishy there.  I'd examine both runs.

What switch is this?  IF this is a switch that runs on IOS-XE, is both Switch 1 and Switch 2 a PoE port?