Optimizing reconvergence in the vcs fabric – Brocade Network OS Administrator’s Guide v4.1.1 User Manual
Page 128
a)
NOTE
In logical chassis cluster mode, the copy running-config startup-config command is not
applicable. Use copy running-config ftp or copy running-config scp.
Identify the principal node (RBridge), by using the show fabric all command.
sw87# show fabric all
VCS Id: 8192
Config Mode: Local-Only
Rbridge-id WWN IP Address Name
---------------------------------------------------------------------------
-
79 10:00:00:27:F8:44:50:C2 10.20.53.79 "sw79"
81 10:00:00:05:33:FA:44:08 10.20.53.81 "sw81"
86 10:00:00:27:F8:0C:D1:BD 10.20.53.86 >"sw86"
87 10:00:00:05:33:FA:4A:48 10.20.53.87 "sw87"*
The Fabric has 4 Rbridge(s)
sw87#
b)
Identify the multicast root node (RBridge), by using the show fabric route multicast
command.
sw87# show fabric route multicast
Root of the Multicast-Tree
==========================
Rbridge-id: 79
Mcast Priority: 1
Enet IP Addr: 10.20.53.79
WWN: 10:00:00:27:f8:44:50:c2
Name: sw79
Rbridge-id: 87
Src-Index Src-Port Nbr-Index Nbr-Port BW Trunk
-----------------------------------------------------------------
0 Te 87/0/1 14 Te 79/0/15 10G Yes
sw87#
6. Identify "odd" and "even" nodes in the cluster, as defined previously in
on page 125.
Once the cluster is dual-homed and redundancy in all layers is established, split the cluster into
"odd" and "even" nodes so that all nodes, either all odd or all even, have traffic connectivity to all
hosts and end devices, resulting in minimal traffic loss.
7. Terminate any Fibre Channel sessions that traverse the fabric.
NOTE
For fabrics that do not support HA, FC/FCoE logins are affected during reloads.
8. Check memory utilization by using the show process memory command, and ensure that the 70%
threshold is not exceeded.
Optimizing reconvergence in the VCS Fabric
While the VCS Fabric is reconverging after odd/even groups are reloaded or coming back into the
fabric, there may be momentary spikes in traffic that can result in traffic loss. Before upgrading/
reloading VDX nodes, it is crucial to ensure that flow control is enabled on the following interfaces to
minimize the impact of reconvergence:
Optimizing reconvergence in the VCS Fabric
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Network OS Administrator’s Guide
53-1003225-04