Lucent Technologies CAJUN M770, User Manual

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Chapter 13 LANE Services
152 Cajun M770 ATM Switch User’s Guide
The LECS in a Cajun M770 ATM Switch
• By default, the M770 ATM Switch will seek a remote LECS at the WKA.
• The M770 ATM Switch pre-defines one ELAN:
— An Ethernet ELAN named “default”. This is the ELAN name that is
requested by several Lucent Technologies’ Ethernet-to-ATM Access
Switches.
• The M770 ATM Switch LECS can support up to 64 ELANs.
• The M770 ATM Switch enables you to specify default ELANs that will be used
when a LEC does not specify the ELAN name but does specify the type of ELAN
it wishes to join. You can also define a default ELAN that will be used when a
LEC does not specify both the ELAN name and the ELAN type.
• The M770 ATM Switch LECS supports a proprietary automatic LES address
determination method to locate a suitable LES for an ELAN.
• All M770 LES will automatically register with the LECS. The benefit of this is
that you do not have to supply the LES address when registering with a M770
LES, and if a M770 LES is re-located you do not have to re-configure the LECS
with the new LES address.
• The M770 ATM Switch LECS supports a proprietary resilient algorithm to
implement LECS redundancy. On failure of an elected active LECS, resilient
LECSes in standby mode will elect a new active LECS. No disruption in the
working of LANE services in the ATM network will be experienced, providing
all resilient LECS have the same database configurations.
Proprietary resilient LECS
The proprietary resilient LECS provides automatic redundancy for the active LECS,
by continuously monitoring the status of all resilient LECS.
From the list of available resilient LECSes on the network, the selection of the
“active LECS” is done by a process of election. To carry out this election, all M770
ATM Switches must have PNNI routing and ILMI enabled. For information about
configuring PNNI routing, see Chapter 10 Managing PNNI Routing.
Note:
If you are not planning to use PNNI routing or want the M770 ATM Switch
switches in the third party environments to host resilient LECS, then you should
contact Lucent Technologies Technical Support. They can provide you with further
information on what manual configuration is required, depending on your third
party switch, to get LECS redundancy on your M770 ATM Switches.