10-01-2019 07:24 PM
Hi Community,
I have ISR 4331 with 3.16 IOS-XE with 4 port switch module ("NIM subslot 0/1", DESCR: "NIM-ES2-4").
Router acting as layer 3 switch.
The downstream access switch connected to port Gi0/1/0 on the Switch module is not seen as cdp neighbour on the ISR
But, on the access switch 3750X, it can see the ISR 4331 as cdp neighbour.
What could be the reason ?
10-01-2019 07:25 PM
10-01-2019 08:27 PM
10-06-2019 11:20 PM
hi Leo,
thanks for responding.
No CDP is turned ON on interface.
10-07-2019 01:11 AM
10-07-2019 05:41 PM
yes it is, and that's the weird bit. the 3850 access switch sees the ISR 4331 as CDP neighbour, but the ISR does not see the acccess switch on CDP on the SW module port.
Code : System image file is "bootflash:isr4300-universalk9.03.16.05.S.155-3.S5-ext.SPA.bin"
SW module : NAME: "NIM subslot 0/1", DESCR: "NIM-ES2-4"
PID: NIM-ES2-4 , VID: V01, SN: FOC204683YU
Interface Config on ISR going to access switch :
wsr-shiel :
!
interface GigabitEthernet0/1/0
description sw-shiel-1 Gi1/0/24
switchport trunk native vlan 980
switchport trunk allowed vlan 900,901,1100,1150,1200,1250,1300,1400,1500,1600
switchport trunk allowed vlan add 1700,2500
switchport mode trunk
switchport nonegotiate
spanning-tree portfast disable
spanning-tree link-type point-to-point
CDP run configured globally
cdp enable done on port.
*********************************
On access switch. :
sw-shiel-1#sh cdp ne
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
wsr-shiel.unimelb.net.au
Gig 1/0/24 146 R S I ISR4331/K Gig 0/1/0
Interface config on uplink interface :
sw-shiel-1#sh run int Gi1/0/24
Building configuration...
Current configuration : 383 bytes
!
interface GigabitEthernet1/0/24
description wsr-elc Gi0/0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 980
switchport trunk allowed vlan 900,901,1100,1150,1200,1250,1300,1400,1500,1600
switchport trunk allowed vlan add 1700,2500
switchport mode trunk
switchport nonegotiate
spanning-tree portfast disable
spanning-tree link-type point-to-point
end
10-07-2019 06:41 PM
10-07-2019 06:48 PM
Tried that Leo. Tried debug CDP, but there seems to be CDP silence on the ports on that SW module.
10-07-2019 07:25 PM
10-07-2019 08:06 PM
Thanks Leo for responding.
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