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New Member

Access Port / CDP Output w/LAP

I'm working through varios QoS labs and and testing with switch access ports connecting to lightweight ap's and I have a question:

My goal is to set a trust DSCP setting on the switch access port connected to a local mode 3502i access point.  My concern is the CDP output Port ID showing up as Gig0.1.  To me that indicates a sub-interface and inherintly a Trunk connection.  Given that I want to trust DSCP, I need to ensure that I'm not negotiating a trunk for that interface.  I typically trust COS on trunk ports and DSCP on access to keep things straight accross the network.

The access point first comes up with interface Gi0, then I see both Gig0 and Gig0.1 until the holdtime expires on Gig0 and I'm left only with Gig0.1 in the end as shown below.

Is this normal or am I just missing somethign entirely?  I have a few outputs below.

Thanks in advance!

//art

3502i access point <---->3750-X Switch

I set the access port as follows:

interface GigabitEthernet6/0/32

description IDF2 2.D.40

switchport access vlan 96

switchport mode access

no logging event link-status

load-interval 30

mls qos trust dscp

spanning-tree portfast

spanning-tree guard root

end

Output from CDP shows:

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

KHS55            Gig 6/0/32        142              R T   AIR-CAP35 Gig 0.1

Switchport output from same interface:

Name: Gi6/0/32

Switchport: Enabled

Administrative Mode: static access

Operational Mode: static access

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: native

Negotiation of Trunking: Off

Access Mode VLAN: 96 (wireless-mgmt)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk Native VLAN tagging: enabled

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk associations: none

Administrative private-vlan trunk mappings: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Appliance trust: none

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Access Port / CDP Output w/LAP

That is normal for an access port when you have an access point connected to it.  Just stick with the basic... access port trust DSCP and FlexConnect using local switching would trust DSCP along with the WLC port.

Thanks,

Scott

*****Help out other by using the rating system and marking answered questions as "Answered"*****

-Scott
*** Please rate helpful posts ***
5 REPLIES
Hall of Fame Super Silver

Access Port / CDP Output w/LAP

That is normal for an access port when you have an access point connected to it.  Just stick with the basic... access port trust DSCP and FlexConnect using local switching would trust DSCP along with the WLC port.

Thanks,

Scott

*****Help out other by using the rating system and marking answered questions as "Answered"*****

-Scott
*** Please rate helpful posts ***
New Member

Access Port / CDP Output w/LAP

Thx Scott - appreciate the response.

//art

Hall of Fame Super Silver

Re: Access Port / CDP Output w/LAP

No problem... Good luck with your testing. Always fun!!!

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

I do not consider "CDP output

I do not consider "CDP output Port ID showing up as Gig0.1" when connected to an access port normal. It's WLC code related and not unique to the C3500 series

One AP, One switch:

Join access point join a controller running 7.4.121.0 and yes you will see the sub-interface Gig0.1 for CDP.

 

Join  AP to controller running version 7.0.235.3. (Make no other changes). The AP will join  the controller, download the code, reboot and then and you will see CDP showing Gig0.

 

Any Cisco guys out there know why? Another undocumented "feature"?

 

New Member

Hi, 

Hi, 

Few access point sticks with port ID Gig 0 & it doesn't come up & get registered in the controller- May i know the cause ? Hope when it change the port id to Gig 0.1 it comes up. Please help here

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