3com 7600 Benutzerhandbuch
Virtual LANs Overview 12-17
Virtual LANs
Overview
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
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.
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
an entry in its LE_ARP cache in the absence of
a verification of that relationship
10 seconds
300 seconds
Unlimited
Forward-delay-
time
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.
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
Response-time
The maximum time that the LEC expects an
LE_ARP request/response cycle to take. Used
for retries and verifies.
LE_ARP request/response cycle to take. Used
for retries and verifies.
1 second
1 second
30 seconds
Topology-
change-flag
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.
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.
response after the request has been sent,
before taking recovery action.
1 second
4 seconds
4 seconds
Path-switching-
delay
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.
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
completion-
timer
In Connection Establishment this is the time
period in which data or a READY_IND
message is expected from a Calling Party.
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
unknown-frame-
count
Maximum number of unknown frames sent
to BUS during the time period
Maximum-unknown-frame-time.
to BUS during the time period
Maximum-unknown-frame-time.
1 frame
1 frame
10 frames
Maximum-
unknown-frame-
time
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.
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
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