11-05-2018 09:16 AM - edited 03-08-2019 04:32 PM
Hello experts.
I am trying to connect a Catalyst 3850 to Nexus 9K.
In the main this has been successful, unfortunately whilst the 9K sees the CDP neighbour fine, and can ping the 3850 switch management address I am unable to ping the 3850 from other subnets.
=== On the Nexus 9K ===
interface port-channel5
description *** Server Room cab 4 top ***
switchport mode trunk
switchport trunk native vlan 111
switchport trunk allowed vlan 10,111,604,631,999
vpc 5
interface Ethernet1/5
description *** Server Room cab 4 top ***
switchport mode trunk
switchport trunk native vlan 111
switchport trunk allowed vlan 10,111,604,631,999
channel-group 5 mode active
show cdp neighbors interface ethernet 1/5 detail
----------------------------------------
Device ID:SGHServer04-Top-3850.xnlg.nhs.uk
VTP Management Domain Name: SGH1
Interface address(es):
IPv4 Address: ##.##.##.##
Platform: cisco WS-C3850-48P, Capabilities: Switch IGMP Filtering
Interface: Ethernet1/5, Port ID (outgoing port): TenGigabitEthernet1/1/3
Holdtime: 138 sec
Version:
Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 15.2(2)E8, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Mon 22-Jan-18 05:56 by prod_rel_team
Advertisement Version: 2
Native VLAN: 111
Duplex: full
Mgmt address(es):
IPv4 Address: ##.##.##.##
The switch configuration is very simple, trunk with the same native vlan 111, and single management IP address in vlan 999.
I seem to be missing s simple trick, any advice ?
With regards
Dave
11-05-2018 09:26 AM
Hi,
Where is the layer-3 interfaces (SVIs) for each vlan?
Can you post configs?
HTH
11-05-2018 12:13 PM
Thanks for responding.
The management interface of the 3850 switch is in VLAN 999
On the 9K I have:
interface Vlan1
no ip redirects
no ipv6 redirects
interface Vlan966
description L3-transit-to-Core
no shutdown
no ip redirects
ip address 10.##.##.##/28
hsrp 3
priority 110
ip 10.##.##.##
interface Vlan999
description Management
no shutdown
ip address 10.##.##.##/23
I am unable to ping from a client VLAN, eg vlan 9 which is just hosts on a separate subnet (routed by a 6500 chassis) to the management address of the switch on VLAN 999.
The 9K can ping the switch fine, and sees the CDP neighbour fine - so I agree its a routing issue, but I'm no expert .
Kind regards
Dave
11-05-2018 12:24 PM
Hi,
In order for other subnets to be able to reach vlan 999 on the 3850, the 3850 need to have a default gateway.
ip default-gateway <ip address of the gateway>
Does the 3850 have this command?
HTH
11-06-2018 02:28 AM
Thanks Reza.
Yes the 3850 has the default gateway configured. If I connect the 3850 to another device I can ping and manage the switch etc. The problem occurs when I connect the 3850 switch to the Nexus 9K, so I believe I've missed a command, just not sure what I've missed. Thanks for taking the time to reply, appreciated. Regards Dave
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