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Virtual LANs Level Troubleshooting 6-5
Identifying VLAN
Splits
After the redundancy in the LAN Emulation Server has taken effect, the
LAN Emulation Clients (LECs) are moved to the backup services. There
may be circumstances where some of the LAN Emulation Clients (LECs)
remain connected to the primary LAN Emulation Server (LES) and are not
moved to the backup LES. This condition creates a VLAN (ELAN) split. The
VLAN split is caused because several LAN Emulation Clients (LECs)
belonging to the same ELAN are bound to different LAN Emulation
Servers. The split may occur when a LAN Emulation Server(LES) fails and
the NMS changes the LAN Emulation Configuration Server database.
Indications in the VLAN Map
You can see the indication of the VLAN split in the VLAN Map when the
icon for the primary VLAN (ELAN), with respect to the backup, is still
green. This condition indicates that LAN Emulation Clients are still
attached.
Under normal circumstances only one ELAN either primary or backup,
should be green.
Indications in the Backbone and Services Window
You can see the indication of a VLAN split in the Backbone and Services
window as different LAN Emulation Clients (LECs), belonging to the same
ELAN, are bound to both the primary and backup LAN Emulation Server
(LES) of an ELAN.
Normal Device operating normally.
Segment Major The device connecting this
segment does not respond
to SNMP.
Brown The first segment on the
device may appear in this
status. All other segments on
the device are operating
normally.
Unknown Device (all segments)
operating normally.
Table 6-5 Color Key for Virtual LANs Icons