Information Technology Reference
In-Depth Information
Table21-2
Troubleshooting LANE Connectivity When LECs Are Up
Possible Problem
Solution
The LE_ARP
cannot be
completed.
Locate an IP address to which you do not have connectivity
(that is, an address that you cannot ping).
1.
Write down its real MAC address. This information can be
obtained from the station itself.
2.
Check that indeed there is no mapping between this MAC
address and an ATM destination address. You can check this
with
show lane le-arp
. Refer to the section “Understanding
the LE_ARP Process,” later in this chapter.
3.
Likely, there is no connectivity with the destination LEC.
Check that the destination LEC is indeed “UP, operational.”
Refer to the next possible problem, regarding an ELAN split
in two parts.
4.
Using SSRP
redundancy, the
ELAN is split in
two parts.
This happens when two clients seem to be up in the same ELAN.
In reality, however, they connect to different LES. There is a big
connectivity problem in the network. A part of the LECs went
down and contacted the backup LECS/LES/BUS. As a result,
both LECs are up but cannot communicate.
1.
Locate two LANE clients between which you do not have
connectivity. Those lane clients are “UP, Operational.”
2.
Issue a
show lane client name <elanname>
command on
both clients.
3.
Check the ATM address in the line with type direct. If the
ATM address is different in the two displays, then you do
have two separated ELANs. This means that one LES was
not reachable on one ELAN and that the backup LES was
contacted.
Using SSRP
redundancy, the
ELAN is split in
two parts.
(continued)
In the LECS database, locate the LES with the highest
priority (which is the one listed first in the database). Then
find the client that contacted a backup address and could not
establish contact with the primary LES. There must be a
serious physical issue between this LEC and the primary
LES.
4.
