WLC Debug and Show Commands

show capwap ids sig dump - Dumps Signatures and Signature Detection Hit Counts including the MAC address with the maximum hits. Also includes current status of IDS packet tracing.
show capwap ids rogue containment <slot#> chan - Displays the current list of Rogue Containment requests at this AP. Containment requests are grouped by channel.
show capwap ids rogue containment <slot#> rad - Displays the current list of Rogue Containment requests at this AP. This list corresponds to the list of requests as received from the controller.

debug capwap ids sig - Turns on debugs for IDS Signature and Containment Detection.

test capwap ids trace match <message type-name> - Turns on tracing for all packets received by the IDS Signature Detection Module of message type=<message type-name>; <message type-name> = FF to trace all message types. Signature Debugs in section 8.2.1 need to be turned on to have the traced packets displayed.
test capwap ids trace rcv <type-name> - Turns on tracing for all packets that match any currently installed signatures for the IDS Signature Detection Module of message type=<message type-name>; <message type-name> = FF to trace all message types that match a signature. Signature Debugs in section 8.2.1 need to be turned on to have the traced packets displayed.

RLDP

Debugs to Collect

On the WLC:

debug dot11 rldp enable

On the AP:

debug lwapp client mgmt

Config and Show Output to Collect

config rogue ap rldp initiate <rogue-mac>

Diagnostic Channel

Debugs to Collect

debug client <client mac>
debug ccxdiag all enable

Captures to Take

Airopeek capture on the channel from which the AP is set. It is recommended to avoid filtering because beacon and probe req/resp packets can be missed.

Config and Show Output to Collect

show sysinfo
show wlan x
show run-config
show tech-support
show debug
show msglog
show client summary
show client detail <client mac>

Client Details

Client hardware
Supplicant software details such as software version, software name (for example, Aironet Desktop Utility [ADU] or Odyssey), and driver version in case of ADU
Client operating system (OS)

Inter Controller Mobility

Debugs to Collect

debug client <client mac> on both WLCs
debug mobility handoff enable on both WLCs (Make sure to remember the order: always enable debug client first.)
Debug pem state enable

If mobility control path or data up is down then turn on 'debug mobility keepalive enable' on both switches (make note of the software version running on both controllers).

If Address Resolution Protocol (ARP) is not working, turn on ‘debug arp all enable’ on both switches.

If DHCP is not working, turn on ‘debug dhcp message enable’ and ‘debug dhcp packet enable’ on both switches.

If IPSec is involved: debug pm sa-export enable, debug pm sa-import enable.

If the client connects after awhile, indicate how long it took.

Captures to Take

Capture according to the roaming type, such as CCKM, PMKID or TGR.

Config and Show Output to Collect

Same as Client connection issue and also these:

show pmk-cache <client mac> (on the target controller)
show client details <client mac> (when client is connected on old AP)
show mobility summary (on both WLCs)

Client Details

Same as particular roaming type, such as CCKM, PMKID or TGR.

Honeypot AP

Captures to Take

Capture Airopeek trace on the channel the trap is received in order to confirm that the rogue is using Cisco's SSID.

Config and Show Output to Collect

show traplog

AirMagnet Integration

Debugs to Collect

On the WLC for NMSP-related issues:

debug wips nmsp enable
debug wips event enable
debug wips error enable

For CAPWAP-related issues:

debug wips event enable
debug wips error enable
debug iapp error enable
debug iapp event enable

For corrupted alarm/device report information:

debug wips all enable

On the AP:

debug capwap am event
debug capwap am error

Captures to Take

Airopeek capture of the attack
Ethereal capture of the reports (sent as data packet)

Config and Show Output to Collect

On the AP:

show capwap am stats
show capwap am buffer [run it few times]
show capwap am policy [alarm-id]
show capwap am alarm [alarm-id]

Make sure the client can associate to the WLAN. If the client cannot, then the problem is at the dot1x level. If using certificates, make sure there are devices and CA certificates installed on the WLC. Also, make sure you have selected the correct certificate issuer in the local-auth config in order to select the correct set of certificates on the WLC.

If using the local database for user credentials, check that the username exists in the database. If using Lightweight Directory Access Protocol (LDAP), see the debugging LDAP section for more debugging information.

Debugs to Collect

WLC:

debug aaa local-auth eap framework errors enable
debug aaa local-auth eap method errors enable
debug aaa local-auth eap method events enable
debug aaa local-auth eap method sm enable
debug aaa local-auth db enable
debug aaa local-auth shim enable

Config and Show Output to Collect

show local-auth config
show local-auth statistics
show local-auth certificates (if using an Extensible Authentication Protocol [EAP] method with certificates)

Client Details

The type of client, plus the EAP configuration details that indicate which method is selected and what parameters are set for that method on the client. Also, the text of any error message seen at the client.

Controller Debug

debug pm pki enable—Details on certificate validation.
debug aaa events enable—This helps if there are any authorization list related issues.
show certificate lsc summary—For any LSC-related summary.

General AAA Authentication

These debugs are helpful for debugging RADIUS authentication, authorization, or accounting issues:

Debugs to Collect

debug client <client mac>—Gives information on how reauth related attributes, such as session-timeout and action-type, are applied.
debug aaa events enable—Helps to troubleshoot how different AAA servers are used for authentication, accounting, and authorization.
debug aaa packet enable—Helps to troubleshoot what different AAA attributes are received and applied.

Captures to Take

A wired capture can be collected between the controller and RADIUS server if the above debugs do not indicate the issue.

Config and Show Output to Collect

Same as Client connection issue and also this:

show radius summary

Client Details

Same as Client connection issue.

TACACS+

Debugs to Collect

debug aaa tacacs enable (at WLC collect the log at the ACS/RADIUS server for accounting)
debug aaa events
debug aaa detail
debug dot11 mobile
debug dot11 state
debug pem events
debug pem state

Captures to Take

A wired capture can be collected between the controller and RADIUS server if the above debugs do not indicate the issue.

Config and Show Output to Collect

show tacacs summary
Change of Authorization (CoA) and Packet of Disconnect (PD) issue - RFC 3576
show radius summary

LDAP

Things to Check Before you Log a Bug

Make sure the LDAP server is pingable from the WLC.

If using Active Directory and local EAP authentication, these EAP methods are not supported:

LEAP
EAP-FAST MSCHAPv2
PEAP MSCHAPv2

This is due to Active Directory not being able to return a clear text password that can be used for the MSCHAPv2 authentication.

Debugs to Collect

debug aaa ldap enable

If the problem occurs when using LDAP with local authentication, see the Local Authentication section for more debugs.

Config and Show Output to Collect

show ldap summary
show ldap <server no.>
show ldap statistics
show local-auth statistics (if the problem occurs when using LDAP with local EAP authentication)

Client Management Frame Protection (MFP)

For All Problems

debug wps mfp client
show wps mfp summary

Config and Show Output to Collect

show wps mfp statistics

Configuration Problems

Controller debugs:

debug wps mfp lwapp
debug lwapp mfp (on Aironet APs)

Client Does not Associate

Controller debugs:

debug wps mfp client
debug wps mfp detail
debug pem state
debug pem events
debug dot1x events

Config and Show Output to Collect:

show msglog
show client detail

Additional 1130/1240 AP Debugs when Client Does not Associate

debug dot11 mgmt msg
debug dot11 aaa manager all (for H-REAP standalone mode)

Aironet AP Debugs when Client Does not Associate in H-REAP Standalone Mode

debug dot11 mfp client
debug dot11 mgmt msg
debug dot11 mgmt interface
debug dot11 mgmt station
debug dot11 supp-sm-dot1x
debug dot11 aaa manager all
debug dot11 wpa-cckm-km-dot1x

Mobility

Controller Debugs

debug wps mfp mm enable
debug mobility directory

Config and Show Output to Collect

show mobility summary
show mobility statistics

Report Problems

Controller Debugs

debug wps mfp report

Config and Show Output to Collect

show wps mfp statistics

Note: Must be invoked immediately after errors are generated.

FIPS Related Issues

When the controller is placed in Federal Information Processing Standard (FIPS) mode, only approved cryptographic functions can be used. As a result, you must lock the SSL down to use TLS_RSA authentication algorithm with AES cipher.

Cannot Break into Boot Menu

This is a feature for FIPS. The feature is enabled using this command:

config switchconfig boot-break disable

Cannot Download New Image

This is a feature for FIPS. Transfer is disabled when boot-break is disabled above.

Wireless Client Using Local Authenticator with EAP-TLS, EAP-FAST and PEAP

Debugs to Collect

Depending on the communication in trouble, these debugs can be enabled:

debug wps cids enable
debug locp event enable
debug emweb server enable
debug aaa local-auth eap method events enable

Captures to Take

Sniffer trace between the WLC and the device with the issue.

Note: The WLC can start communication as soon as the relevant service starts. It is recommended to start sniffer before the WLC powers up.

Config and Show Output to Collect

show switchconfig

512 WLANs/AP Groups

512 WLANs

A 512 WLANs bug is if the client can connect to a 'default-group' AP, but cannot connect to an AP set to a custom AP group.

Show Output to Collect on the Controller:

show sysinfo
show running-config
show wlan summary
show wlan apgroup
show msglog

Show Output to Collect on the AP:

show controller
show capwap client mn
show log

Debugs to Collect:

debug client xx:xx:xx:xx:xx:xx
debug group enable
debug capwap event

Note: These debugs or any other debug should be switched ON after issuing the debug client <client mac> command. This command causes all previous debugs to be disabled.

Trace to Collect:

wireless trace

AP Groups

Any problems related to adding or deleting the AP group, or adding interface to the AP group.

Show Output to Collect:

show sysinfo
show running-config
show wlan summary
show wlan apgroup
show msglog

Debugs to Collect:

debug group enable

ACLs, Pre Auth ACLs and CPU ACLs

>show acl ?
summary        Display a summary of the Access Control Lists.
detailed       Display detailed Access Control List information.
cpu            Display CPU Acl Information

DHCP

Debug DHCP In-Band

debug dhcp message enable
debug dhcp packet enable

Debug DHCP for the Service-Port Enable

debug dhcp service-port enable

Guest Access Related Issues

Guest WLAN

debug mobility handoff enable
debug pem events enable
debug pem state enable

For DHCP Problems:

debug dhcp packet enable
debug dhcp message enable

For Mobile Connection Problems:

debug dot11 events enable
debug dot11 mobile enable

For RADIUS/AAA Problems:

debug dot1x aaa enable

WLC High Availability Issues

AP Failover

Configuration Issue

Collect and examine these configurations files:

All related WLC configuration files—show run-config and show running-config.
Is AP failover priority configured?
Per AP primary WLC ("Primary Cisco Switch [Name | IP Address]" field under "AP Config")
Per AP secondary WLC ("Secondary Cisco Switch [Name | IP Address]" field under "AP Config")
Per AP tertiary WLC( "Tertiary Cisco Switch [Name | IP Address]" field under "AP Config")
The corresponding AP configuration parameters in WLC—show ap config <AP name>.
The only supported AP modea for fast-heartbeat are local and h-reap ("AP Mode" field).
The corresponding AP configuration parameters in AP—show capwap client config.

Failover to Unexpected WLC

show sysinfo—The maximum number of APs supported by the expected WLC.

show ap summary— APs that have joined the expected WLC.

show capwap client ha—If fast-heartbeat is enabled, examine the backup list in the AP.

Transport Issue

If DHCP is enabled for AP Ethernet interface, has it fetched an IP address? Use show interface FastEthernet0.

ping <IP address>—Determines whether the AP and WLC can ping each other.

CAPWAP Protocols

Common WLC and AP debug commands:

Debug CAPWAP events and state—debug capwap events enable/disable
Debug CAPWAP errors—debug capwap errors enable/disable
Debug CAPWAP details—debug capwap detail enable/disable
Debug CAPWAP info—debug capwap info message enable/disable
Debug CAPWAP payload—debug capwap payload enable/disable
Debug CAPWAP hexdump—debug capwap hexdump enable/disable

AP fast-heartbeat specific debug command:

Debug fast-heartbeat—show capwap client ha

Note: Sometimes you need the network analyzer (such as wireshark) output.

AP Priority

Determine whether the AP priority is enabled—show run-conf ("AP Join Priority" field under "Network Information")
Determine the maximum number of APs supported by the WLC—show sysinfo ("Maximum number of AP supported")
Determine how many APs have joined the WLC—show ap summary
Examine the join priority of each AP—show ap summary (last column)

Transporter and CAPWAP Issues

See the corresponding sessions in the AP Failover section.

show tech-support
show run-config
show running-config
show ap config general <AP name>
show capwap client config

Controller H-REAP Related Issues

H-REAP

Controller Debugs:

debug client <mac>

AP Debugs:

debug lwapp reap mgmt
debug dot11 mgmt msg
debug dot11 mgmt int

H-REAP CCKM Issues

Controller Debugs:

debug cckm
debug hreap cckm

AP Show/Debugs:

debug lwapp reap mgmt
debug dot11 aaa manager key
debug lwapp reap cckm
debug dot11 mgmt msg
show lwapp reap cckm

H-REAP Local RADIUS

Controller Debugs:

debug hreap group
debug hreap aaa

AP/Show Debugs:

debug lwapp reap
debug lwapp client config
show run

Media-Stream

debug media-stream

Admission—Client admission debugs that are useful when debugging client denial/delist issues.
Event—Dumps IGMP / Media direct client updates.
RRC—RRC state machine updates.

debug bcast

igmp—Client IGMP join request/report messages.

Location Related Issues

>show location ?

ap-detect      Display devices detected by specified AP
detail         Display detailed location information.
plm            Display Location's Path Loss Measurement(CCX S60) Configuration
statistics     Display Location Based System statistics.
summary        Display Location Based System summary information.

System Memory, Out of Memory Issues

Config and Show Output to Collect

show memory stat
show buffers
show process memory

Note: If the "config memory monitor errors" flag is set to "disable", the memory corruption details can be uploaded using these commands:

transfer upload datatype errorlog
transfer upload filename memerrors.txt
transfer upload start

Mesh Related Issues

There are multiple points of failure (or bug presence):

Controller
Mesh APs
GUI/WLC

General Guidelines

Identify point of failure and isolate the failing component.
Correlate traces from the controller, Mesh APs, and also visual output on the CLI/GUI/WLC to identify the failure point.
In case of packet related issues, collect Airopeek or ethereal traces to confirm preliminary analysis.
Analyze the reason for the failure and how the problem can be reproduced.
Configuration
Trigger action

Overall Guidelines

This section is intended to provide enough pointers to debug a mesh bug and collect relevant information to help the DEs understand the bug more efficiently. Given that it might be impossible to pin-point a bug at first glance, this document is written as a set of suggestions for the DT rather than a rule-book. It is expected that the DT will use discretion to attach relevant debugs in order to help study efficiently and resolve the bug as quickly as possible.

Suspect Packets Go Missing

Collect Ethereal and Airopeek traces.

Debug Command Sets

This is a set of generic debug commands that can be used to obtain information about the system.

General Show CLI:

show version
show capwap client rcb
show mesh status
show mesh module adjacency
show mesh channel [current]

Test Mesh CLI:

test mesh adjacency—for Mesh adjacency test commands
test mesh astools—for MESH Anti-strand tools
test mesh awpp—for Mesh AWPP test commands
test mesh disable—for disabling a feature
test mesh enable—for enabling a feature
test mesh forwarding—for Mesh forwarding test commands
test mesh linktest—for test for mesh link test
test mesh mperf—for MESH BW test tool

Specific Issues

any link connection issue
debug mesh link
show mesh adjacency (child/parent/all)

Radio:

show controller d0, d1, ... (for all Radio-related issues)
Traces from the air (between the affected nodes)

Interface (Data Traffic related) issues:

show int d0, d1, G0, G1, ...
Ethernet Traces between controller and Roof-top Access Point (RAP)

Forwarding:

show mesh forwarding table
debug mesh forwarding [table/packet]
show mesh forwarding links
show mesh forwarding port-state
debug mesh forwarding port-filter

IP Address/DHCP:

debug ip address
show ip int bri
show int bvi1
show run int bvi 1
show mesh forwarding port-state
test mesh disable port-filter, and ping router

IP Traffic and DHCP:

debug ip udp
debug ip icmp
debug dhcp [detail]

Exclusion Listing:

debug mesh adjacency exclusion—Watch events related to excluding parents.
test mesh adjacency exclusion clear—Clear out the current exclusion listing counters and start fresh.

Adjacency State Machine:

debug mesh adjacency event
debug mesh adjacency state
debug mesh adjacency timer

Adjacency Communication:

debug mesh adjacency packet
debug mesh adjacency message

Adjacency Link Issues:

debug mesh adjacency channel
debug mesh adjacency neighbor
debug mesh adjacency parent

Signal-to-noise Ratio (SNR) Changes:

debug mesh adjacency snr

Dynamic Frequency Selection (DFS):

debug mesh adjacency dfs

Workgroup Bridge (WGB) Does Not Associate:

Collect client debugs on the controller and the AP.
Collect Airopeek sniffer traces between the WGB and parent Mesh AP.
Wired Client behind the WGB cannot pass traffic.
Get state of the parent WGB on the controller.
Collect debugs on the controller, Mesh AP and WGB.
Collect Ethereal traces between the parent Mesh AP and controller.

AP Cannot Be JOINED:

Collect Debug Message on the Controller:
- debug capwap errors enable
- debug capwap events enable
Collect Debug Message on the AP:
- debug capwap client event
- debug capwap client error

For more information, use these additional debugs:

Controller Debugs:
- debug capwap detail enable
- debug capwap info enable
- debug capwap payload enable
- debug capwap hexdump enable
AP Debugs:
- debug capwap client config
- debug capwap client detail
- debug capwap client fwd
- debug capwap client hexdump
- debug capwap client info
- debug capwap client payload
- debug capwap client reassembly

Show Commands:

show capwap client rcb—shows radio control block configuration
show capwap client config—shows radio configuration from nvram

Test Commands:

test mesh lwapp restart
test mesh mode bridge/local
test mesh role rap/map
test mesh bgn xxxx
test lwapp console cli
test lwapp controller ip

Anti-Stranding Tools:

AP Commands

debug mesh astools
event -- Event debugs
level -- Level of detail in debugs
packet -- packet related debugs
timer -- timer debugs

Controller
- debug mesh astools troubleshoot <MAC addr>—The b/g radio MAC address of the stranded AP.
Show Commands
- show mesh astools config—current configuration
- show mesh astools stranded-ap-list—print list of detected stranded
APs - No Beacons are Heard
- Make sure there is at least one neighboring AP that has joined the controller and is capable of listening to the stranded AP.
- Show cont d0 to determine the current operating channel of 11b radios.
- Collect all possible debugs that are relevant.

Mperf bandwidth measurement tool:

Show Commands

show mesh mperf ?
globals --- Print configuration used to spawn objects
print [all/id] --- Print active connections

Debug Commands

debug mesh mperf ?
bwreport -- Bandwidth output reports
fds -- Multiple connection state machine multiplexing
general -- All general debugs
jitter -- Jitter calculations
sockdata -- Socket data RX and TX
timer -- Timer related

Issues with NTP Client and Time Configuration on the Controller

debug ntp packet enable
debug ntp low enable
debug ntp detail enable
show time
Ethereal capture on controller management port

RF Component Issues for the WLCs

>debug airewave-director ?

all            Configures debug of all Airewave Director logs
channel        Configures debug of Airewave Director channel assignment protocol
error          Configures debug of Airewave Director error logs
detail         Configures debug of Airewave Director detail logs
group          Configures debug of Airewave Director grouping protocol
manager        Configures debug of Airewave Director manager
message        Configures debug of Airewave Director messages
packet         Configures debug of Airewave Director packets
power          Configures debug of Airewave Director power assignment protocol
radar          Configures debug of Airewave Director radar detection/avoidance protocol
plm            Configures debug of CCX S60 Power Measurement Loss messages
rf-change      Configures logging of Airewave Director rf changes
profile        Configures logging of Airewave Director profile events

SNMP Component for WLCs

>debug snmp ?

all            Configures debug of all SNMP messages.
agent          Configures debug of SNMP agent.
mib            Configures debug of SNMP MIB.
trap           Configures debug of SNMP traps.
engine         Configures debug of SNMP engine.

Attach the Simple Network Management Protocol (SNMP) command which failed.
If the WCS indicates that SNMP failed, then try to run the SNMP set/get command either from MG-soft or any other SNMP manager.
Check to see if it works from the Controller UI or CLI.
Attach a screenshot of the CLI/Controller UI.
If there are memory leaks or CPU issues, mention how long the system has been up.
Look at the SNMP debugs to see if anything is evident.
- debug snmp mibs enable o debug snmp agent enable
- debug snmp traps enable.
Attach out of the above debugs.

Issues with TFTP Upload/Download Including Upgrade/Downgrade

>debug transfer tftp ?

disable        Disables debug.
enable         Enables debug.

Web GUI Component for WLCs

Mention which browser issue is seen.
Check if any java script issue is present. If using Firefox, check the error console. Attach a screenshot of the java script error. Internet Explorer will show a popup window. For Firefox, attach the error console window.
If the configuration is failing, check with the CLI. Attach the CLI output.
Attach the screenshot to the bug.
Mention the controller and AP platform.
If there is a crash in emweb task, then look at the crash stack trace. If the stack trace indicates CLI, then do not use this component.

Webauth Config and Authentication Issues

debug pm ssh-appgw enable
debug pm ssh-tcp enable

WLC-Webauth-Template

Basic Information

Determine the topology of the network at the time webauth was performed.

Is it a guest setup or normal association at a single WLC, or after roam webauth was done?
What kind of webauth is configured (internal, external, customized or web-passthru)?
What is the login page used?
Download the webauth bundle and provide that.
Have you enabled secure-web? If yes, disable and see if webauth works.

Show Commands:

show client details <mac>
show wlan <wlanid>
show rules show custom-web

Debug

debug emweb server enable
debug pm ssh-tcp enable
debug pm ssh-engine enable packet <>
debug pm ssh-appgw enable
debug client <mac>

Note: Issue this debug if the page is not displayed. Make sure to collect this debug seperately.
debug mobility handoff enable

Note: Issue this debug if webauth does not work after roam.

Sniffers

WLC DS port—This is helpful for a RADIUS authentication problem.

WLC AP port—if http packets are dropped between the WLC and AP

Over the air—if the AP is dropping packets

Controller XML Config Related Issues and Enhancements

XML Validation

XML Validation Error messages, such as Validation for node ptr_apfCfgData.apfVAPIDData.apfVapSecurity.<any configuration data>, are observed during system boot.
the whole XML validation error message
the CLI or GUI procedure to configure the WLANs before system boot
the CLI or XML config file that is generated and saved to TFTP before system boot
show invalid-config

Diagnostic Channel

debug client <client mac>
debug ccxdiag all enable

Dynamic Channel Allocation

debug airwave-director channel enable
debug airwave-director radar enable

TACACS+

debug aaa tacacs enable
show tacacs summary

WLC-Multicast-Guide

Basic Information

Topology of the network
Make sure the multicast stream address is not the IANA reserved address for the application that is in use.
Multicast addresses being used
The multicast stream rate and packet size
Make sure the configured AP group multicast address is not the same as the multicast stream address.
The WLC model (2106, 4404, 4402, WiSM...)
The AP model (1131, 1232, 1242, 1250...)
Radio the client is using
MAC address of the client

WLC Information (All Flavors)

Dumps of:

show interface summary

debug bcast * enable
show network summary
show network multicast mgid summary
show network multicast mgid detail <mgid>
For G release and later: show wlan apgroups
For TALWAR/2106 with new FP code:
- If IGMP snooping is enabled, debug fastpath cfgtool --mcast4db.dump debug fastpath cfgtool --mcast2db.dump
- If IGMP Snooping is disabled, debug fastpath cfgtool --mcast2db.dump
- If Multicast-Unicast is enabled, debug fastpath cfgtool --mcastrgdb.dump

AP Information (All Flavors)

Dumps of:

show lwapp mcast

show lwapp mcast mgid all

show lwapp mcast mgid id <mgid>

show lwapp client traffic-four times with 1 minute interval

Radio Debugs:

The Ethernet overrun rate
The radio transmit rate
The radio discard rate
The power-save mode of the basis service set (BSS)
The total Ethernet RX rate
The Ethernet multicast RX rate

For #1, run the show int g0 | inc overrun command periodically.

For #2, #3 and #4, run the show cont d0 | beg queues command periodically. Look at the send/discard counts for each queue.

Also for #3, run the show int d0 | inc output drop command periodically.

For #5, run the show cont g0 | inc RX count command periodically.

For #6, run the show cont g0 | inc multicast command periodically. The first line shows the RX multicast/broadcast.

In order to get the packet rates, run a command every 10 seconds and divide the difference by 10.

If a lot of packets are sent on the Mcast queue (for a BSS), then the BSS is in power-save mode. The maximum multicast packet rate for a power-save BSS is relatively low. This is a well-known issue.

Switch Information

Check the switch version with the show version command. The switch should have the "advance ip base" version (for example, Cisco IOS Software, C3750 Software [C3750-ADVIPSERVICESK9-M], Version 12.2(40)SE, RELEASE SOFTWARE (fc3). [image: c3750-advipservicesk9-mz.122-40.SE.bin]). The "ip base" version has an issue in routing inter-VLAN multicast traffic.

Some debugs:

Check if multicast routing is enabled. ("show run" should include "ip multicast-routing distributed" )

Check if "ip pim sparse-dense-mode" config is added to the VLAN configured.

show ip igmp group

Sniffer Captures

DS interface of the WLAN
Mgmt interface of the WLC
Ap-Mgr to which the AP is connected (only required when mcast src is wireless)
Eth interface of the AP
On the air

Analysis of Sniffer Captures

Multicast Source is Wired Side

Check if the packets reach the WLC on the DS interface.
Check if the LWAPP encapsulated multicast packet is sent on the mgmt interface. The packet must have:
- outer ip dst addr = configured ap group multicast address
- udp dst port = 12224
Check if the packet seen in 'b' is seen at the eth intf of the AP.
Check if the mcast stream packet is seen on the air.

Multicast Source is Wireless Side

Check if the LWAPP encapsulated packets are received at ap-mgr intf. Here, LWAPP is unicast.
Check if a multicast packet is sent from the DS intf.
Check if the LWAPP encapsulated multicast packet is sent on the mgmt interface. The packet must have:
- outer ip dst addr = configured ap group multicast address
- udp dst port = 12224
Check if the packet seen in 'b' is seen at the eth intf of AP.
Check if the mcast stream packet is seen on the air.

Switch Configuration Check for WiSM

Check if you are facing the issue mentioned below when you use a Wireless Services Module (WiSM).

Cisco bug ID CSCsj48453—CAT6k does not forward multicast traffic to WISM in L3 mode.

Symptom—Multicast traffic stops flowing from a wired host to a wireless host through the WiSM card in L3 mode, for example when both the hosts are in different VLANs. Only the first packet reaches successfully. Thereafter, the traffic stops.

Conditions—The traffic stops only when the multicast replication mode is egress.

Workaround—A workaround is to change the multicast replication mode to ingress using the mls ip multicast replication-mode ingress command. The traffic flows properly in the ingress mode. Verify the same using the show mls ip multicast capability command.

Further Problem Description—The problem is seen with CAT6k and a WiSM. The multicast traffic flowing from the wireless host to the wired host works fine, even in L3. Also, the multicast traffic flowing from the wired host to the wireless host through the WiSM card works fine in L2 mode.

WLC-QoS-Guide

Minimum Debugs

Get the ‘show run-config’ from all switches in the mobility group.
When the problem occurs, capture these debugs:
- debug aaa all enable
- debug pem state enable
- debug pem events enable
- debug mobility handoff enable
- debug dot11 mobile enable
- debug dot11 state enable
Get an Airopeek or AirMagnet trace near the problematic AP/phone/handset.
Get an Ethereal or Etherpeek capture of the switch DS port, the AP upstream switch, and the SpectraLink Voice Priorities (SVPs).

CallControl (SIP Classification) Debug

Questions

Is it an Session Initiation Protocol (SIP) client?
What IP PBX\sip server is it using?
Is it showing registered on that given SIP server?
Does 7921 work as expected, and only the SIP clients have an issue?

WLC Information

show wlan summary [wlan #]
Debug call-control all
Debug call-control events
Show call-control errors
Show call-control calls

AP Information

Debug dot11 cc details
Debug dot11 cc errors
Debug dot11 cc events
Show lwapp client call-info mac (MAC address of client in question)

Load Based Admission Control and Voice Metrics

Questions to Answer

Does it happen with both radios ‘a’ and ‘b’?
What is the Channel Utilization value when the call is rejected?
Is this with 7921 phones only, or with other phones as well? If yes, what are the phones? If not, can this be tried on another TSPEC phone?
Is this with 11n or regular APs?
Are you doing inter-controller mobility?
Is the TSPEC phone capable?
Is it doing UAPSD?
Is this reproducible on 2006 or 4100 platforms?
Is it a shielded room environment?
Was there a special condition for which the call was rejected?

Debug and Show Commands on WLC for LBCAC

debug cac all enable
show 802.11a/b/g
show wlan <wlan id>
show ap stats 802.11a/b/g <ap-name>
show ap auto-rf 802.11a/b/g <ap-name>

Debug the AP for LBCAC

debug dot11 cac unit
debug dot11 cac metrics
debug dot11 cac events

Voice Metrics

Over the air and wire sniffer captures

Check to see if UP6 traffic is being generated continuously.

Make sure the WLAN has the right QoS profile and the Wi-Fi Multimedia (WMM) policy.

Most of the questions asked for LBCAC are applicable for voice metrics.

Debugs and show commands on the WLC for voice metrics:
- show 802.11a/b/g o show wlan <wlan id>
  
  show ap stats 802.11a/b/g <ap-name>
  
  show ap stats 802.11a/b/g <ap-name> tsm
  
  show client tsm 802.11a/b/g <client-mac> <AP mac>
  
  debug iapp packet enable o debug iapp error enable
  
  debug iapp all enable o debug client <client mac>
Debugs on the AP for voice metrics:
- debug dot11 tsm
- debug lwapp client voice-metrics

WLC-License-Guide

Debugs to Collect on Controller

Console output
msglog

ARP Issues

Debugs to Collect on Controller

debug arp all enable

Network Issues

Debugs to Collect on Controller

debug packet logging enable
dump-low-level-debugs

Others

Debugs to Collect on Controller

dump-low-level-debugs
msglog

Access Point Issues

IAPP

show wgb summary
show wgb detail <wgb mac>

WGB Association Issues

debug dot11 mobile enable
debug dot11 state enable
debug pem events enable
debug pem state enable
debug iapp all enable

WGB or Wired Client Does not Get DHCP Address

debug dhcp packet enable
debug dhcp message enable

WGB or Wired Client Uses Static IP Address but IP Address Does not Appear on Controller

debug dot11 mobile enable
debug dot11 state enable

AP Username Password

Debugs to Collect on AP

debug lwapp client config

Captures to Take

Not applicable.

Config and Show Output to Collect

config ap mgmtuser

Client Connection Issues

Client Debug

debug client xx.xx.xx.xx.xx.xx

Controller Does not Like the Association Request

Packet Capture

Airopeek capture on the channel from which the AP is set. It is recommended to avoid filtering because the beacon and probe req/resp packets can be missed. Make sure to capture the event when the connection is terminated.

In case the client is not connecting, then capture the whole event starting from prob request until the session gets terminated (for example, deauth is sent and association response with status-code as non 0).

Provide the client and AP MAC addresses.

Note: The AP MAC will be base Radio MAC + WLAN-ID.

Config and Show Output to Collect on the Controller

show sysinfo—WLC’s version details

show wlan x—on WLC for the affected WLAN

show run-config—of WLC

show debug

show msglog

show tech-support—of WLC (good to have, but not necessary)

Client Details

Client hardware—Supplicant software details such as version and software name (for example, ADU or Odyssey)
Client OS—If it is Windows, provide the client system configuration by going to Programs > Accessories > System Tools > System Information.

RADIUS Server Details

Provide the RADIUS server type (SBR, Cisco ACS, Linux, etc.) and configuration if applicable.

CCKM Roaming Fails

Debugs to Collect

Most of the debugs are the same as the previous section, Client connection issue. However, these new debugs will help more in CCKM debugging. This debug command is available from 5.0 and later:

debug cckm enable

show pmk-cache <client mac>—on the target controller

show client details <client mac>—when client is connected on the old AP

debug cckm enable

Note: These debugs or any other debug must be switched ON after you issue debug client <client mac> . This is because the debug client <mac> command causes all previous debugs to be disabled.

Captures to Take

Make sure you capture on the channel where the target AP is. For example, you want to capture all management packets between the client and the target AP. See the Controller Does not Like the Association Request section for more information.

Config and Show Output to Collect on Controller

See the Controller Does not Like the Association Request section and issue these commands:

show pmk-cache <client mac>—on the target controller
show client details <client mac>—when client is connected on the old AP

Client Details

See the Controller Does not Like the Association Request section.

PMKID Caching Fails

Check if the client supports opportunistic key cache (OKC).

Note: OKC is not the same as proactive key cache (PKC) as specified in 802.11I. The WLC only supports OKC.

Debugs to Collect

See the Controller Does not Like the Association Request section.

Captures to Take

Make sure you capture on the channel where the target AP is. For example, you want to capture all management packets between the client and the target AP.

See the Controller Does not Like the Association Request section.

Config and Show Output to Collect on Controller

See the Controller Does not Like the Association Request section and issue these commands:

show pmk-cache <client mac>—on the target controller
show client details <client mac>—when client is connected on the old AP

Client Details

See the Controller Does not Like the Association Request section.

Reauth Issues

Debugs to Collect

See the Controller Does not Like the Association Request section.

Captures to Take

Not applicable.

Config and Show Output to Collect on Controller

See the Controller Does not Like the Association Request section and issue these commands:

show radius summary
show client details <client mac>
show pmk-cache <client mac>

Client Details

See the Controller Does not Like the Association Request section.

802.11R (Fast Transition) Roaming Does Not Work

Debugs to Collect

debug client <client mac>
debug ft events enable
debug ft keys enable

Captures to Take

In case of over the air roaming, collect Airopeek capture on the channel where the target AP is. For example, you want to capture all 802.11 auth FT req/resp frames and reassociation req/resp.

In case of over the DS roaming, collect Airopeek capture on the channel where the source AP is. For example, you want to capture reassociation req/resp frames. You also want to capture Action frame’s FT req/resp on the source AP’s channel.

Note: It is recommended to keep the source and destination APs in the same channel in order to debug the 802.11R roaming issue. This allows you to capture FT req/resp and reassociation req/resp in a single capture file.

Config and Show Output to Collect on Controller

See the Controller Does not Like the Association Request section and issue these commands:

show pmk-cache <client mac>—on the target and source controller
show client details <client mac>—when client is connected on the old AP
show mobility summary—to get the mobility domain ID

Client Details

Currently, only the WGB is the known 802.11R client. See the Controller Does not Like the Association Request section for more information.

Inter Controller Mobility

Debugs to Collect

debug client <client mac>—on both WLCs
debug mobility handoff enable—on both WLCs (Remember the order: always enable debug client first.)
Debug pem state enable
Eping <ip>
Mping <ip>

If mobility control path or data up is down then turn on 'debug mobility keepalive enable' on both switches (make a note of the software version running on both controllers).

If ARP is not working, turn on ‘debug arp all enable’ on both switches.

If DHCP is not working, turn on ‘debug dhcp message enable’ and ‘debug dhcp packet enable’ on both switches.

If IPSec is involved: debug pm sa-export enable, debug pm sa-import enable.

If the client connects after awhile, indicate how long it took.