I have been tasked with establishing communications from my Cisco 4510 R+E core switch via a new fiber run (MM, OM3, 945ft) to Cisco 2960X switch. I'm using pairs of new Cisco SPF-10G-SR's on either end of the fiber.
Before deploying the remote 2960X switch I tested the config's and all 2m fiber patch cables by simply plugging the remote 2960x switch to the 4510 switch. Once connected they immediately formed Trunk links. I further tested by adding a host pc to the remote 2960X switch and it pulled via DHCP a IP address from the correct VLAN. I was satisfied with those results.
I then deployed the 2960X to it's remote location and the results were much different. The 4510 fails to see any SFP connected to the remote end.
r 24 13:24:17: %SFF8472-5-THRESHOLD_VIOLATION: Te5/2: Rx power low alarm; Operating value: -40.0 dBm, Threshold value: -13.9 dBm.
Mar 24 13:24:23: %SFF8472-5-THRESHOLD_VIOLATION: Te6/2: Rx power low alarm; Operating value: -40.0 dBm, Threshold value: -13.9 dBm.
I thought immediately I had physical layer with the run of fiber. I have had it tested and meets standards.
The 2960X also fails to detect the 4510 switch. Just for grins I had 'jumpered' fiber pairs 1 to 2 in the data center end and the 2960X logged this:
Mar 17 07:35:02: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/1, changed state to up
Mar 17 07:35:02: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/2, changed state to up
Mar 17 07:35:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to up
Mar 17 07:35:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/2, changed state to up
Mar 17 07:35:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up
Mar 17 07:42:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to down
Mar 17 07:42:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to down
Mar 17 07:42:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/2, changed state to down
Mar 17 07:42:21: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/1, changed state to down
Mar 17 07:42:21: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/2, changed state to down
This tells me the long run of fiber is good.
In my thinking I have tested in steps, the physical layer from 4510 SFP to remote 2960X SFP's.
I have included the relevant config lines of both switches.
4510 uses etherchannel 10.
boot system flash bootflash:cat4500e-universal.SPA.03.04.04.SG.151-2.SG4.bin
interface Port-channel10
description "Uplink to IDF 'F'"
switchport
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport mode trunk
!
interface TenGigabitEthernet5/2
description "Uplink to IDF 'F'"
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport autostate exclude
switchport mode trunk
no keepalive
channel-protocol lacp
channel-group 10 mode active
!
interface TenGigabitEthernet5/3
!
interface TenGigabitEthernet5/4
!
interface TenGigabitEthernet6/2
description "Uplink to IDF 'F'"
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport autostate exclude
switchport mode trunk
no keepalive
channel-protocol lacp
channel-group 10 mode active
************************************************
Config from 2960X switch,
Cisco IOS Software,(C2960X-UNIVERSALK9-M), Version 15.0(2)EX3
interface Port-channel2
switchport access vlan 10
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport mode trunk
!
interface TenGigabitEthernet1/0/1
switchport access vlan 10
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport mode trunk
channel-group 2 mode active
!
interface TenGigabitEthernet1/0/2
switchport access vlan 10
switchport trunk native vlan 10
switchport trunk allowed vlan 5,10,15
switchport mode trunk
channel-group 2 mode active
I don't know any debug commands to try since the 4510 is not even seeing the other end.
