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832 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring IP parameters – Layer 3 Switches
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• If the IP forwarding sharing cache contains a forwarding entry for the destination, the device
uses the entry to forward the traffic.
• If the IP load forwarding cache does not contain a forwarding entry for the destination, the
software selects a path from among the available equal-cost paths to the destination, then
creates a forwarding entry in the cache based on the calculation. Subsequent traffic for the
same destination uses the forwarding entry.
Response to path state changes
If one of the load-balanced paths to a cached destination becomes unavailable, or the IP route
table receives a new equal-cost path to a cached destination, the software removes the
unavailable path from the IP route table. Then the software selects a new path.Disabling or
re-enabling load sharing
To disable IP load sharing, enter the following commands.
PowerConnect(config)# no ip load-sharing
Syntax: [no] ip load-sharing
Changing the maximum number of ECMP (load sharing) paths
You can change the maximum number of paths the Layer 3 Switch supports to a value from 2
through 8. Table 150 shows the maximum number of paths supported per device.
For optimal results, set the maximum number of paths to a value at least as high as the maximum
number of equal-cost paths your network typically contains. For example, if the Layer 3 Switch you
are configuring for IP load sharing has six next-hop routers, set the maximum paths value to six.
NOTE
If the setting for the maximum number of paths is lower than the actual number of equal-cost paths,
the software does not use all the paths for load sharing.
To change the number of IP load sharing paths, enter a command such as the following.
PowerConnect(config)# ip load-sharing 6
Syntax: [no] ip load-sharing [<num>]
The <num> parameter specifies the number of paths and can be from 2 through 8, depending on
the device you are configuring.
Configuring IRDP
The ICMP Router Discovery Protocol (IRDP) is used by Layer 3 Switches to advertise the IP
addresses of its router interfaces to directly attached hosts. IRDP is disabled by default. You can
enable the feature on a global basis or on an individual port basis:
• If you enable the feature globally, all ports use the default values for the IRDP parameters.
TABLE 150 Maximum number of ECMP load sharing paths per device
PowerConnect B-Series FCX
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