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ATM Version I.11.00.100
Known Problems and Workarounds
— You have an ELAN connectivity problem, and your ATM switch’s manufacturer
diagnoses the problem as being caused by the absence of the LAN type during
configuration.
— Your ATM switch provides the capability of specifying the LAN type during
configuration, and you have configured the LAN Emulation services to require the
LAN type during configuration.
Workaround: The only way you can do this is to manually specify the LAN type (the
parameter is called lan_type) in the ELAN interface’s configuration file; you cannot do
this within SAM. Set the parameter HP_ATM_ELAN_TYPE as follows:
HP_ATM_ELAN_TYPE = 802.3 for Ethernet
HP_ATM_ELAN_TYPE = 802.5 for Token Ring
However, keep in mind that each time you use SAM to modify the interface’s
configuration, SAM overwrites the ELAN interface configuration file. So, for example,
you’ve manually specified the LAN type in an ELAN interface’s configuration file. Then,
you later use SAM to modify some other part of the interface’s configuration. When you
save the configuration in SAM, the previous configuration file (with the LAN type you
manually specified) is overwritten. This means you then must manually re-edit the
configuration file to re-specify the LAN type.
•
At this time, HP’s implementation of Multiprotocol Over ATM (MPOA) supports putting
the MPS on only a FORE router.
•
In MPOA, if a shortcut route consists of MPCs that are on HP systems and an MPS that is
on a Cisco router, when you try to send traffic over that shortcut, no data will be
transferred over the shortcut. This might cause the applications to hang. If you issue the
command atmmgr card_instance_number show on the MPCs, you will see that a
shortcut VCC is established between the MPCs. However, the traffic will not be able to
travel over the shortcut VCC.
•
In an HA configuration with local recovery, if you have floating IP addresses configured,
you may not be able to traffic after both the primary and backup elan interfaces go down,
and the primary elan interface comes up before the secondary interface. If both elan
interfaces come up, you may recover normal traffic on the secondary interface, by forcing
the primary interface to go down temporarily, for instance, by disconnecting and
reconnecting the cable (do not reset either the ATM card or the elan interface). If you
want the traffic back on the primary interface, for instance, after traffic has resumed on
the secondary interface and the primary is up, force the secondary interface to go down
temporally by disconnecting and reconnecting the cable (do not reset either the ATM card
or the elan interface).
Chapter 2
15
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