Alcatel Carrier Internetworking Solutions 6800 User Manual
Troubleshooting Group Mobility
Troubleshooting a VLAN Mobility Failure
OmniSwitch Troubleshooting Guide
September 2005
page 9-3
With VLAN mobility, it is critical that the network administrator have a good understanding of the traffic
on their network in order to assign proper rules. It is not only important to verify the required rules have
been configured, but it is also important to understand the concept of precedence for rules that may over-
lap. In addition, it is important not to design beyond the limitations of the software. This can be verified by
referencing the latest release notes for the current software revision.
on their network in order to assign proper rules. It is not only important to verify the required rules have
been configured, but it is also important to understand the concept of precedence for rules that may over-
lap. In addition, it is important not to design beyond the limitations of the software. This can be verified by
referencing the latest release notes for the current software revision.
To verify the rules that have been configured, use the show vlan rules CLI command as shown below:
-> show vlan rules
11.2.1.1.1.1.1 Legend: type: * = binding rule
type vlan rule
-----------------+------+-------------------------------------------------------
11.2.1.1.1.1.1 Legend: type: * = binding rule
type vlan rule
-----------------+------+-------------------------------------------------------
ip-net 255 21.0.0.0, 255.0.0.0
protocol 355 ipx-e
mac-ip-port* 1500 00:da:95:00:ce:3f, 21.0.0.43, 3/10
dhcp-mac-range 255 00:da:95:00:59:10, 00:da:95:00:59:9f
protocol 355 ipx-e
mac-ip-port* 1500 00:da:95:00:ce:3f, 21.0.0.43, 3/10
dhcp-mac-range 255 00:da:95:00:59:10, 00:da:95:00:59:9f
To determine if a port has seen traffic that has matched a configured rule, use the show vlan port [slot/
port] CLI command with the slot/port option shown below:
port] CLI command with the slot/port option shown below:
-> show vlan port 6/1
vlan type status
--------+---------+--------------
vlan type status
--------+---------+--------------
1 default forwarding
255 mobile forwarding
If the desired group is not present, and there are no other mobile groups present for the switch, verify the
port is set to mobile and that a BPDU has not turned off mobility.
port is set to mobile and that a BPDU has not turned off mobility.
If there are other groups learned on the port, but one is missing verify both the rule configuration as well
as the traffic on the ingress of that port. Note rule precedence if there is a possibility for overlapping rules.
as the traffic on the ingress of that port. Note rule precedence if there is a possibility for overlapping rules.
A sniffer may be useful to verify the traffic coming into the port is what is expected.
Binding Rules
Note that for a frame to be classified into a vlan with binding rules, the frame must match ALL binding
rules, for it to be classified into that particular vlan. If it does not match all binding rules, the frame will
either be classified as default, or another vlan should it match other rules configured on the switch
rules, for it to be classified into that particular vlan. If it does not match all binding rules, the frame will
either be classified as default, or another vlan should it match other rules configured on the switch
Port Rules
Port rules only apply to outgoing mobile port traffic and do not classify incoming traffic. If a mobile port
is specified in a port rule, its incoming traffic is still classified for VLAN assignment in the same manner
as all other mobile port traffic.
is specified in a port rule, its incoming traffic is still classified for VLAN assignment in the same manner
as all other mobile port traffic.