Order of switches when setting FSPF back to default per VSAN

[david.marsh1]

When disabling and enabling FSPF on a VSAN (to take settings back to the default) is there a certain order of which switch in the fabric to start with? Also, is there any risk of an interruption when changing back to default?, i.e., when you set FSPF on one VSAN on a switch in a fabric back to default, but the same VSAN on the other switches haven't been changed yet. If anyone has a help link to a document I would appreciate it. What I'm finding on Cisco Support just isn't specific enough.

[Walter Dey]

Hi David

The critical issue is the domain id, which is defined per VSAN and switch; if this value would change, all the attached devices would need to do a flogi, which is disrupting the traffic for a short moment.

I would start with the principle switch for this particular VSAN (see below)

I believe resetting the FSPF should not change the existing domain id. (see below)

However, I would highly recommend that you configure static domain id's to avoid such situations. (see below)

http://www.cisco.com/en/US/docs/storage/san_switches/mds9000/sw/san-os/quick/guide/qcg_ids.html

Display the current domain_ID for VSAN 3000 using the command show domain-list

switch# show fcdomain domain-list vsan 3000
Number of domains: 2
Domain ID WWN
--------- -----------------------
0xef(239) 2b:b8:00:05:30:00:68:5f [Local] [Principal]

Enable persistent FC_ID with fcid persistent.

switch(config)# fcdomain fcid persistent vsan 3000
switch(config)# end

Default FSPF Settings

FSPF
Enabled on all E ports and TE ports.
SPF computation
Dynamic.
SPF hold time
0.
Backbone region
0.
Acknowledgment interval (RxmtInterval)
5 seconds.
Refresh time (LSRefreshTime)
30 minutes.
Maximum age (MaxAge)
60 minutes.
Hello interval
20 seconds.
Dead interval
80 seconds.
Distribution tree information
Derived from the principal switch (root node).
Routing table
FSPF stores up to 16 equal cost paths to a given destination.
Load balancing
Based on destination ID and source ID on different, equal cost paths.
In-order delivery
Disabled.
Drop latency
Disabled.
Static route cost
If the cost (metric) of the route is not specified, the default is 10.
Remote destination switch
If the remote destination switch is not specified, the default is direct.
Multicast routing
Uses the principal switch to compute the multicast tree.

[santkumd528]

Enabling persistent_FCID needs any fcdomain restart?