Virtual LANs Overview
12-17
Virtual LANs
Overview
Virtual LANs
(vLANs) represent location-independent logical user groups.
LAN Emulation allows you to create enterprise-wide vLANs that closely
correspond to how your network and business actually function. The
VCC-timeout An LEC should release any Data-direct VCC
that has not been used to transmit or receive
any data frames for the length of the VCC
timeout period. This parameter is only
meaningful for SVC Data-direct VCCs.
None specified 20 minutes Unlimited
Aging-time The maximum time that an LEC will maintain
an entry in its LE_ARP cache in the absence of
a verification of that relationship
10 seconds 300 seconds Unlimited
Forward-delay-
time
The maximum time that an LEC will maintain
an entry for a non-local MAC address in its
LE_ARP cache in the absence of a verification
of that relationship, as long as the Topology
Change flag is true.
4 seconds 15 seconds 30 seconds
Expected LE_ARP
Response-time
The maximum time that the LEC expects an
LE_ARP request/response cycle to take. Used
for retries and verifies.
1 second 1 second 30 seconds
Topology-
change-flag
Boolean indication that the LEC is using the
Forward delay time instead of Aging time to
age non-local entries in its LE_ARP cache.
N/A N/A N/A
Flush-timeout Time limit to wait to receive a LE_FLUSH
response after the request has been sent,
before taking recovery action.
1 second 4 seconds 4 seconds
Path-switching-
delay
The time since sending a frame to the BUS
after which the LEC may assume that the
frame has been either discarded or delivered
to the recipient. May be used to bypass the
Flush protocol.
1 second 6 seconds 8 seconds
Connection-
completion-
timer
In Connection Establishment this is the time
period in which data or a READY_IND
message is expected from a Calling Party.
1 second 4 seconds 10 seconds
Maximum-
unknown-frame-
count
Maximum number of unknown frames sent
to BUS during the time period
Maximum-unknown-frame-time.
1 frame 1 frame 10 frames
Maximum-
unknown-frame-
time
Within the period of time defined by the
Maximum-unknown-frame-time, a LEC will
send no more than
Maximum-unknown-frame-count frames to
the BUS for a given unicast LAN destination.
1 second 1 second 60 seconds
Table 12-6 LEC Operational Parameters (continued)
Parameter Description Minimum Default Maximum
abtthgde.book Page 17 Tuesday, June 23, 1998 10:29 AM
