Brocade Communications Systems Brocade 8/12c User Manual page 694

20
Adding an FCIP circuit
4. Select the IP Address for each port. This implementation of IPv6 uses unicast addresses for
5. For IPv4 addresses, specify the Subnet Mask. For IPv6 addresses, specify the prefix length.
6. Enter the MTU Size.
7.
8. The Metric option is used to identify a failover circuit. By assigning a non-zero metric (1), you
9. Select values for bandwidth settings. An uncommitted bandwidth is not allowed on an FCIP
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the interfaces with FCIP circuits. The unicast address must follow the RFC 4291 IPv6 standard
and use the IANA assigned IPv6 Global Unicast address space (2000::/3).
The default is created from the IP address and Subnet Mask. If you want to create a route
through a gateway router, click Create Non-Default Route, and select a Gateway address.
For SAN traffic, the largest possible MTU (Maximum Transmission Unit) size is generally the
most efficient. Enter a value between 1260 and 2348 for the 4 Gbps platforms and between
1260 and 1500 for the 8 Gbps plaforms. MTU rates must match on both ends of the tunnel.
If you have an active connection between switch one and switch two, click Suggest under
Switch One Settings. To determine a suggested size, packets are sent across the FCIP tunnel,
starting at the largest possible size packet that can be sent over IP. If a valid connection
response is not received, a smaller packet is sent. This continues until a valid connection
response is received, and that size becomes the suggested MTU. MTU settings must match at
both ends of the tunnel, and the setting specified under Switch One Settings is automatically
applied to switch two.
NOTE
Suggest button function requires and active IP connection. The button is not available for the
Add FCIP Circuit and Edit FCIP Circuit dialog boxes for 8 Gbps Extension platforms.
If a VLAN ID is used to route frames between the switches over the physical connection, enter
the VLAN ID under Switch One Settings. You must assign the VLAN ID to both switches. You can
assign the same or different VLAN IDs to each switch.
The VLAN ID is an integer value between 1 and 4094 which sets the VLAN tag value in the
header assigning the traffic to that specific VLAN. Layer two class of service (L2CoS) values
may be assigned to establish traffic priorities over a VLAN. This is done as an Advanced
Setting.
identify the circuit as a failover circuit. By default, a circuit is assigned a metric of 0. If a circuit
fails, FCIP trunking tries first to retransmit any pending send traffic over another circuit with a
metric of 0. If no circuits with a metric of 0 are available, then the pending send traffic is
retransmitted over any available circuit with a metric of 1.
The default metric value for a crossport circuit configuration will be 1. If a failover circuit is
created with a metric of 0, it will be used for load balancing and not for failover.
circuit. You must select Committed bandwidth. If you want to use ARL, set Minimum and
Maximum bandwidth values. Bandwidth grows towards the maximum and reduces towards the
minimum based on traffic conditions. If you do not want to use ARL, set Minimum and
Maximum to the same value to set a single committed bandwidth. Refer to
Limiting" on page 637 for more information about ARL.
NOTE
The committed value range in the Add FCIP Circuit dialog box depends on the extension switch
or blade platform.
"Adaptive Rate
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