vlan span between dell and cisco switch

[bbb bbb]

Dear Everyone,

Good day

Seeking advice on this scenario in a client environment. We are trying to establish gateway reachability from PC2 connected in Cisco 9300 but not able yield positive result. Trunks are configured on Port-channel where physical interfaces are member of. Access port is also configured for each corresponding port.

Core Switch - Gateway for VLAN 1-5 and 6-10, located in Datacenter1

Dell S5232F-ON - 10G/100G links, connected with trunk (Port-channel), located in Datacenter 2,

Dell S5248F-ON - 1G/10G links, connected with trunk (Port-channel), located in Datacenter2

Cisco 9300 - 1G/10G links, connected with trunk (Port-channel), located in Datacenter2

Configuration at Cisco 9300

Cisco9300#show lldp neighbors
Capability codes:
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID Local Intf Hold-time Capability Port ID
DELL-S5248F-ON Gi1/0/46 120 P,B,R ethernet1/1/6:1

Total entries displayed: 1

Cisco9300#
Cisco9300#sh run int port-channel 120
Building configuration...

Current configuration : 168 bytes
!
interface Port-channel120
description Cisco 9300<>DELL S5248F-ON
switchport trunk allowed vlan 5,6-10
switchport mode trunk
end

Cisco9300#
Cisco9300#sh run int g1/0/46
Building configuration...

Current configuration : 165 bytes
!
interface GigabitEthernet1/0/46
switchport trunk allowed vlan 5, 6-10
switchport mode trunk
channel-group 120 mode active
end

Cisco9300#sh interfaces trunk

Port Mode Encapsulation Status Native vlan
Po120 on 802.1q trunking 1

Port Vlans allowed on trunk
Po120 5,6-10

Port Vlans allowed and active in management domain
Po120 5,6-10

Port Vlans in spanning tree forwarding state and not pruned
Po120 5,6-10
Cisco9300#
Cisco9300#show lldp neighbors
Capability codes:
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID Local Intf Hold-time Capability Port ID
DELL-S5248F-ON Gi1/0/46 120 P,B,R ethernet1/1/6:1

Total entries displayed: 1

Cisco9300#
Cisco9300#show run interface g1/0/8

interface GigabitEthernet1/0/8
description link to PC2
switchport access vlan 5
switchport mode access
spanning-tree portfast
end

Configuration at DELL switch S5248F-ON

DELLS5248F-ON# show running-configuration interface port-channel 150
!
interface port-channel150
no shutdown
switchport mode trunk
switchport access vlan 95
switchport trunk allowed vlan 5, 6-10
vlt-port-channel 150
DELLS5248F-ON#
DELLS5248F-ON#
DELLS5248F-ON# show running-configuration interface ethernet 1/1/6:1
!
interface ethernet1/1/6:1
no shutdown
channel-group 150 mode active
no switchport
flowcontrol receive off
DELLS5248F-ON#
DELLS5248F-ON# show vlan 5

Codes: * - Default VLAN, M - Management VLAN, R - Remote Port Mirroring VLANs,
@ - Attached to Virtual Network, P - Primary, C - Community, I - Isolated,
S - VLAN-Stack VLAN
Q: A - Access (Untagged), T - Tagged
NUM Status Description Q Ports
5 Active VLAN5 T Po150
A Eth1/1/46:1
DELLS5248F-ON#

DELLS5248F-ON# show running-configuration interface ethernet 1/1/46:1
!
interface ethernet1/1/46:1
description link to PC1
no shutdown
switchport access vlan 5
flowcontrol receive off
DELLS5248F-ON#

DELLS5248F-ON## show lldp neighbors
Loc PortID Rem Host Name Rem Port Id Rem Chassis Id
--------------------------------------------------------------------------------------
ethernet1/1/6:1 Cisco9300 Gi1/0/46 c2:1d:80:c2:1d:80
ethernet1/1/46:1 Not Advertised 00:3f:00:00:00:83 00:3f:00:00:00:83

Looking forward to your responses. Best regards

[Enes Simnica]

hello @bbb bbb . Based on the provided information and the diagram my Cisco friend, it looks like the issue stems from a configuration mismatch on the Dell S5248F-ON uplink interface toward the Cisco 9300.

this line in the Dell config:

interface ethernet1/1/6:1
no switchport

This means the interface is configured as a Layer 3 routed port, not a switchport trunk carrying VLANs. As a result, even though Port-Channel150 is defined as a trunk, the physical member interface connecting to the Cisco 9300 is effectively not forwarding VLAN 5 traffic, hence why PC2 can’t reach the VLAN 5 gateway.

Meanwhile, PC1 is working fine because its access port on the Dell switch is correctly configured in VLAN 5.

also i would recommend u some configs or changes: 

1. Convert the Dell interface ethernet1/1/6:1 back to a switchport so it participates in VLAN trunking:

interface ethernet1/1/6:1
switchport
switchport mode trunk
switchport trunk allowed vlan 5,6-10
channel-group 150 mode active

2. After applying verify using some show commands like;: show interfaces trunk, show spann vlan 5, show vlan..

3. And test reachabillity from pC2 to the vlan 5 gateway again.......

and check this links for more help:https://www.dell.com/support/kbdoc/en-us/000122519/how-to-create-vlans-on-a-dell-networking-powerconnect-switches

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst1000/software/releases/15_2_7_e/configuration_guides/vlan/b_1527e_vlan_c1000_cg/configuring_vlan_trunks.pdf

as usual, hope its not a loong answer, and hope it helps! PEACE!

-Enes

[bbb bbb]

Dear Enes,

Yes I did the trunk configuration on the interface level before setting up a port-channel. Did not yield positive result either.

Best regards

[M02@rt37]

@bbb bbb 

Provide from your DELL the output of that command:

show port-channel summary

Thanks.

[M02@rt37]

Hello @bbb bbb 

On you Dell switch DELLS5248F-ON,  interface 1/1/6:1 is configured with "no switchport" command.

Try to do "switchport" command to swap this interface in pur L2 state please.

[bbb bbb]

Dears,

There is no option for me to do switchport only command. please see below config

DELLS5248F-ON#show running-configuration interface ethernet 1/1/6:1

!

interface ethernet1/1/6:1

no shutdown

channel-group 150 mode active

no switchport

flowcontrol receive off

DELLS5248F-ON# configure terminal

DELLS5248F-ON(config)# interface ethernet 1/1/6:1

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport

access Set access mode characteristics of the interface

mode Enter the port mode access/trunk

port-security Enable port security on this interface

trunk Configure trunking parameters on an interface

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport

access mode port-security trunk

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport

% Error: Ambiguous command.

DELLS5248F-ON(conf-if-eth1/1/6:1)#

regards

[MHM Cisco World]

switchport mode ?  <<- mode word allow you to specify the port access or trunk 

[bbb bbb]

Dear MHM,

Please see below syntax based on the suggestion.

DELLS5248F-ON(config)# interface ethernet 1/1/6:1

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport

access Set access mode characteristics of the interface

mode Enter the port mode access/trunk

port-security Enable port security on this interface

trunk Configure trunking parameters on an interface

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport mode

access Port mode access

trunk Port mode trunk

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport mode trunk

<cr>

DELLS5248F-ON(conf-if-eth1/1/6:1)# switchport mode trunk

% Error: Configured as a lag interface

DELLS5248F-ON(conf-if-eth1/1/6:1)#

[bbb bbb]

Dears,

Comparing existing Trunk (Port-channel) configuration on DELL S5248F-ON switch have the same settings above.

DELLS5248F-ON# show port-channel summary

Flags: D - Down I - member up but inactive P - member up and active

U - Up (port-channel) F - Fallback Activated IND - LACP Individual

--------------------------------------------------------------------------------

Group Port-Channel Type Protocol Member Ports

--------------------------------------------------------------------------------

140 port-channel140 (U) Eth DYNAMIC 1/1/53(P) 1/1/54(P)

150 port-channel150 (U) Eth DYNAMIC 1/1/6:1(P)

DELLS5248F-ON# show running-configuration interface ethernet 1/1/53

!

interface ethernet1/1/53

description UPLINK

no shutdown

channel-group 140 mode active

no switchport

flowcontrol receive off

DELLS5248F-ON# show running-configuration interface ethernet 1/1/54

!

interface ethernet1/1/54

description UPLINK

no shutdown

channel-group 140 mode active

no switchport

flowcontrol receive off

DELLS5248F-ON# show running-configuration interface port-channel 140

!

interface port-channel140

no shutdown

switchport mode trunk

switchport access vlan 1

switchport trunk allowed vlan 5,6-10

vlt-port-channel 140

DELLS5248F-ON# show running-configuration interface port-channel 150

!

interface port-channel150

no shutdown

switchport mode trunk

switchport access vlan 1

switchport trunk allowed vlan 5,6-10

vlt-port-channel 150

DELLS5248F-ON#

[MHM Cisco World]

Now it L2 trunk 

And Port channel U (up) and port member (P)

So every thing is OK

[bbb bbb]

still not reachable.

[MHM Cisco World]

What STP mode run in both side?

MHM

[bbb bbb]

Dear,

Both switch running with rstp. Connectivity is established after modifying the trunk configuration on each interfaces of the switch.

Best Regards,

[MHM Cisco World]

But sorry cisco not support rstp it support rapid PVST 

Anyway glad issue is solved now 

MHM

[bbb bbb]

thank you and appreciated for your insight