Controllers in a mobility list communicate with each other by controlling information over a UDP port 16666 ( src & dst port are both 16666 ) & data traffic through an EoIP tunnel (IP protocol 97). Because UDP & EoIP are not reliable transport mechanism, there is no guarantee that a mobility control packet or data packet will be delivered to a mobility peer.
You can test the mobility communication environment by performing mobility ping tests. Two ping tests are available.
1. Mobility ping over UDP – This test runs over mobility UDP port 16666. It test whether the mobility control packet can be reached over the management interface.
2. Mobility ping over EoIP – This test runs over EoIP. It tests the mobility data traffic over management interface
These ping tests are not ICMP based & the term “ping” is used to indicate an echo request and an echo reply message.
So here is how these test can be run on WLC CLI. First of all you should have a list of controllers in your mobility list.
(WLC1) >show mobility summary
Symmetric Mobility Tunneling (current) .......... Enabled
Symmetric Mobility Tunneling (after reboot) ..... Enabled
Mobility Protocol Port........................... 16666
Default Mobility Domain.......................... mrn-cciew
Multicast Mode .................................. Enabled
Mobility Domain ID for 802.11r................... 0x4ccd
Mobility Keepalive Interval...................... 10
Mobility Keepalive Count......................... 3
Mobility Group Members Configured................ 3
Mobility Control Message DSCP Value.............. 0
Controllers configured in the Mobility Group
MAC Address IP Address Group Name Multicast IP Status
00:0b:85:40:a1:c0 10.10.112.10 mrn-cciew 239.239.239.239 Control and Data Path Down
00:0b:85:43:d8:60 10.10.111.10 mrn-cciew 239.239.239.239 Up
00:1b:d5:cf:e6:00 10.10.120.140 mrn-ccie 0.0.0.0 Up
“mping <mobility_peer_IP> ” & “eping < mobility_peer_IP> ” are the CLI command you need to run.
(WLC1) >mping 10.10.120.140 Send count=3, Receive count=3 from 10.10.120.140 (WLC1) >eping 10.10.120.140 Send count=3, Receive count=3 from 10.10.120.140
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Related Posts.
1. Wireless Mobility Basics
2. Configuring Mobility on WLC
3. L2-Inter Controller Roaming
4. L3-Inter Controller Roaming
5. WLC – Web Authentication
6. Configuring Auto Anchor
7. Auto-Anchor Foreign Mapping
8. Configuring Wired Guest
9. Static IP Clients Mobility
mrn-cciew 
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