Brocade Fabric OS Command Reference Guide v6.1.0 (53-1000599-02, June 2008)

Fabric OS Command Reference 431
53-1000599-02
portCfg
2
modify tunnel_id [arguments]
Modifies the properties of the existing FCIP tunnel. This disrupts the traffic on
the specified FCIP tunnel for a brief period of time. If IPsec is enabled on the
FCIP tunnel, the tunnel cannot be modified. To change it, you must delete and
re-create the tunnel.
Optional arguments for fciptunnel modify include:
-b comm_rate Specifies the committed traffic rate on the FCIP tunnel in Kbps. Valid
range is 1,544 to 1,000,000. Specify "0" for an uncommitted tunnel.
Uncommitted tunnels compete for bandwidth. Changing com_rate is
potentially disruptive.
-c 0|1 Disable (0) or enable (1) compression on the existing tunnel.
-f 0|1 Disable (0) or enable (1) fastwrite on the existing tunnel.
-k timeout Specifies the keep alive timeout, in seconds, for the existing tunnel. Valid
timeout values are 8 to 7,200; default is 10. If tape pipelining is enabled,
minimum value is 80.
-q control_dscp
DSCP (DiffServ Code Point) Marking for a tunnel's TCP control
connection. Valid range is from 0 to 63 (inclusive). Default value is 0.
-Q data_dscp DSCP(DiffServ Code Point) Marking for a tunnel's TCP control connection.
Valid range is from 0 to 63 (inclusive). Default value is 0.
-M Turns on default QoS mapping in the specified tunnel. Default is off.
There are two ways of prioritizing network traffic over FCIP tunnels:
Differentiated Services (DSCP) and Layer 2 Class of Service (L2CoS). If
the -M option is set, the VC on the FCIP outbound frame is mapped to
both a DSCP and L2CoS value. These default values can be modified on
a per-FCIP tunnel basis with the fciptunnel qosmap option. The -M option
can be turned on or off at anytime. Qosmap settings are unaffected by
the -M option.
-m time Specifies the minimum retransmit time, in milliseconds, for the existing
tunnel. Valid time values are 20 to 5,000; default is 100.
-r retransmissions
Specifies the maximum retransmissions for the existing tunnel. Values
are 1 to 16; default is 8. If tape pipelining is enabled, the default value is
calculated based on the minimum retransmit time to ensure that the TCP
connection does not time out before the host times out. When changing
this value, the value specified must be greater than the calculated value.
-s 0|1 Disable (0) or enable (1) selective acknowledgement (SACK) on the
existing tunnel.
-t 0|1 Disable (0) or enable (1) tape pipelining on the existing tunnel (requires
fast write to be turned on as well).