10-09-2013 10:53 AM - edited 03-07-2019 03:56 PM
I am trying to bring up a trunk between a 3750G stack and (2) Nexus 3048. The uplinks on the 3048's are using 1gig MM SFP. The ports on the 3750 stack are configured as a port channel. I have checked the SFPs, they are valid. I had swapped out fiber patch cables, SFPs. I have included the configurations below, so any help is appreciated!
Configuration on the 3750 stack:
!
interface GigabitEthernet4/0/7
description ***To C1R2NX3048-1***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,255
switchport mode trunk
channel-group 11 mode active
end
!
interface GigabitEthernet5/0/7
description ***To C1R2NX3048-2***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,255
switchport mode trunk
channel-group 11 mode active
end
!
interface Port-channel11
description *** To C1C2NX3048***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,255
switchport mode trunk
end
Nexus #1 Configuration:
interface Ethernet1/49
description TO-C1R2CS3750-1
switchport mode trunk
switchport trunk allowed vlan 1,255
speed 1000
channel-group 101 mode active
!
interface port-channel101
description L2-TO-WLS1C1R1CS3750-2
switchport mode trunk
vpc 101
switchport trunk allowed vlan 1,255
spanning-tree port type normal
speed 1000
port-channel101 is down (No operational members)
vPC Status: Down, vPC number: 101
Hardware: Port-Channel, address: 0000.0000.0000 (bia 0000.0000.0000)
Description: TO-C1R1CS3750-2
MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, auto-speed
Beacon is turned off
Input flow-control is off, output flow-control is off
Switchport monitor is off
EtherType is 0x8100
Members in this channel: Eth1/49
Last clearing of "show interface" counters never
30 seconds input rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
0 unicast packets 0 multicast packets 0 broadcast packets
0 input packets 0 bytes
Ethernet1/49 is down (Link not connected)
Hardware: 1000/10000 Ethernet, address: c08c.603d.4f98 (bia c08c.603d.4f98)
Description: TO-C1R2CS3750-1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, 1000 Mb/s, media type is 1G
Beacon is turned off
Input flow-control is off, output flow-control is off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
Last link flapped never
Last clearing of "show interface" counters 22:13:17
30 seconds input rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
0 unicast packets 0 multicast packets 0 broadcast packets
0 input packets 0 bytes
Nexus #2 Configuration
interface Ethernet1/49
description TO-C1R2CS3750-1
switchport mode trunk
switchport trunk allowed vlan 1,255
speed 1000
channel-group 101 mode active
interface port-channel101
description TO-C1R1CS3750-2
switchport mode trunk
vpc 101
switchport trunk allowed vlan 1,255
speed 1000
Ethernet1/49 is down (Link not connected)
Hardware: 1000/10000 Ethernet, address: c08c.603d.51d8 (bia c08c.603d.51d8)
DescriptionTO C1R2CS3750-1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, 1000 Mb/s, media type is 1G
Beacon is turned off
Input flow-control is off, output flow-control is off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
Last link flapped never
Last clearing of "show interface" counters 02:31:20
30 seconds input rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
0 unicast packets 0 multicast packets 0 broadcast packets
0 input packets 0 bytes
0 jumbo packets 0 storm suppression packets
0 giants 0 input error 0 short frame 0 overrun 0 underrun
0 watchdog 0 if down drop
0 input with dribble 0 input discard(includes ACL drops)
0 Rx pause
TX
0 unicast packets 0 multicast packets 0 broadcast packets
0 output packets 0 bytes
0 jumbo packets
0 output errors 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble
0 Tx pause
0 interface resets
port-channel101 is down (No operational members)
vPC Status: Down, vPC number: 101
Hardware: Port-Channel, address: 0000.0000.0000 (bia 0000.0000.0000)
Description: TO-C1R1CS3750-2
MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, auto-speed
Beacon is turned off
Input flow-control is off, output flow-control is off
Switchport monitor is off
EtherType is 0x8100
Members in this channel: Eth1/49
Last clearing of "show interface" counters never
30 seconds input rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 bytes/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
0 unicast packets 0 multicast packets 0 broadcast packets
0 input packets 0 bytes
0 jumbo packets 0 storm suppression packets
0 giants 0 input error 0 short frame 0 overrun 0 underrun
0 watchdog 0 if down drop
0 input with dribble 0 input discard(includes ACL drops)
0 Rx pause
TX
0 unicast packets 0 multicast packets 0 broadcast packets
0 output packets 0 bytes
0 jumbo packets
0 output errors 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble
0 Tx pause
0 interface resets
10-09-2013 12:03 PM
Hello Dan.
- What if you remove the configuration, are the interface coming up as individuals?
- What if you try to loop the fiber cables, for example plug the fiber from the interface 4/0/7 to the 5/0/7 in the same stack, is the interface coming up? try the same test in the 3k.
Can you put in a notepad the output of the following commands and attach it.
- Show log (both switches)
- Show interface status err-disable. (both switches)
- Show inventory (both switches)
- Show version.
Regards.
Wilson B.
10-09-2013 01:09 PM
Hi Wilson-
Thanks for the reply. To answer your questions:
- If i remove all of the configuration, they do NOT come up. All interfaces still show as not connected.
- I can loop the fiber cables and get lights. I looped the two nexus switches on eth1/49 on both switches successfully, and 4/0/7 to 5/0/7 successfully.
Attached is the output that you were looking for. Thanks again!
10-09-2013 03:11 PM
Hi Dan.
Thank you for the ouputs, I checked the show inventory, it doesn't populate the transceivers number, only the serial number, and when I search for the transceiver serial number it doesn't show up with any result. So are those cisco transceivers? ...
can you share the transceiver part number!
Regards.
Wilson B
10-10-2013 08:08 AM
Wilson-
I noticed that as well when I sent this to you. I am going to reboot that switch tonight, because there are all Cisco transceivers in it, and there are some other funny things going on.
I found the issue with this. On the 3750G ports, I had to set 'speed nonegotiate' on the trunks going to the 3k's.
Thank you for the help!
12-06-2013 12:24 AM
Dear Dan,
The Same Issue I am facing with my Nexus Switch and 3750 Core Switch, Can u Pls Guide me How to Fix this issue?
CDP Neighbour shows the device, but not pinging.
Thanks,
Tamizh
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