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Fabric OS Administrator’s Guide
63
53-1002446-01
Chapter
4
Routing Traffic
In this chapter
•
Routing overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
•
Inter-switch links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
•
Gateway links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
•
Routing policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
•
Route selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
•
Frame order delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
•
Lossless Dynamic Load Sharing on ports . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
•
Enabling forward error correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
•
Frame Redirection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Routing overview
Data moves through a fabric from switch to switch and from storage to server along one or more
paths that make up a
route
. Routing policies determine the path for each frame of data.
Before the fabric can begin routing traffic, it must discover the route a packet should take to reach
the intended destination. Route tables are lists that indicate the next hop to which packets are
directed to reach a destination. Route tables include network addresses, the next address in the
data path, and a cost to reach the destination network. There are two kinds of routing protocols on
intranet networks, distance vector and link state.
•
Distance vector is based on hop count. This is the number of switches that a frame passes
through to get from the source switch to the destination switch.
•
Link state is based on a metric value based on a cost. The cost could be based on bandwidth,
line speed, or round-trip time.
With the link-state protocol, switches that discover a route identify the networks to which they are
attached, receiving an initial route table from the principal switch. After an initial message is sent
out, the switch only notifies the others when changes occur.
It is recommended that no more than seven hops occur between any two switches. This limit is not
required or enforced by Fabric Shortest Path First (FSPF). Its purpose is to ensure that a frame is
not delivered to a destination after Resource Allocation TimeOut Value (R_A_TOV) has expired.
Fabric OS v7.0.1 supports unicast Class 2 and 3 traffic, multicast, and broadcast traffic. Broadcast
and multicast are supported in Class 3 only.
Summary of Contents for Fabric OS v7.0.1
Page 1: ...53 1002446 01 15 December 2011 Fabric OS Administrator s Guide Supporting Fabric OS v7 0 1 ...
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Page 214: ...176 Fabric OS Administrator s Guide 53 1002446 01 Management interface security 7 ...
Page 228: ...190 Fabric OS Administrator s Guide 53 1002446 01 Brocade configuration form 8 ...
Page 248: ...210 Fabric OS Administrator s Guide 53 1002446 01 Validating a firmware download 9 ...
Page 334: ...296 Fabric OS Administrator s Guide 53 1002446 01 Setting up TI over FCR sample procedure 12 ...
Page 360: ...322 Fabric OS Administrator s Guide 53 1002446 01 Encryption and compression example 14 ...
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Page 430: ...392 Fabric OS Administrator s Guide 53 1002446 01 Ports on Demand 18 ...
Page 502: ...464 Fabric OS Administrator s Guide 53 1002446 01 Buffer credit recovery 23 ...
Page 572: ...534 Fabric OS Administrator s Guide 53 1002446 01 Hexadecimal overview D ...
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