Footnote 1: Normally an ISL port with PFC is supported for 200m
distance on eAnvil-based platforms. The long-distance-isl command
extends that support up to a distance of 10 km, including 2 Km and
5 Km options. For a 10 Km ISL link, no other ISL links are allowed
on the same ASIC. For 5 Km and 2 Km ISL links, another short
distance ISL link can be configured. A maximum of 3 PFCs (per
priority flow control) can be supported on a long distance ISL
port.
Footnote 1: In this release, you can trunk two 40GE ports to
link to another VDX 6740.
Layer 2 Forwarding
Revision 1013 6 47
CEF 300
Layer 2 Forwarding
Revision 1013 6 50
CEF 300
The Deficit Weighted Round Robin (DWRR) algorithm is used to
schedule packets from the transmit queues. If a queue uses excess
bandwidth, the DWRR algorithm keeps track of this excess usage and
subtracts it from the queues next transmission bandwidth
allocation. This results in a fairer use of bandwidth over
time.
Footnote 1: The hash algorithm can be changed using the fabric
ecmp load-balance command. For more information see the .Network OS
Administrators Guide Supporting Network OS v4.0.0 manual.
