Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 77)

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.
Maximum number of ECMP load sharing paths per device TABLE 8
FSX 800 / FSX 1600 FCX ICX6450 / ICX6610 / ICX6650 / ICX7750
6 8 8
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.
To change the number of IP load sharing paths, enter a command such as the following.
device(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.
ICMP Router Discovery Protocol configuration
The ICMP Router Discovery Protocol (IRDP) is used by BrocadeLayer 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.
• If you leave the feature disabled globally but enable it on individual ports, you also can configure the
IRDP parameters on an individual port basis.
NOTE
You can configure IRDP parameters only an individual port basis. To do so, IRDP must be disabled
globally and enabled only on individual ports. You cannot configure IRDP parameters if the feature is
globally enabled.
When IRDP is enabled, the Layer 3 switch periodically sends Router Advertisement messages out the
IP interfaces on which the feature is enabled. The messages advertise the Layer 3 switch IP addresses
to directly attached hosts who listen for the messages. In addition, hosts can be configured to query the
Layer 3 switch for the information by sending Router Solicitation messages.
Some types of hosts use the Router Solicitation messages to discover their default gateway. When
IRDP is enabled on the BrocadeLayer 3 switch, the Layer 3 switch responds to the Router Solicitation
messages. Some clients interpret this response to mean that the Layer 3 switch is the default gateway.
If another router is actually the default gateway for these clients, leave IRDP disabled on the
BrocadeLayer 3 switch.
IRDP parameters
IRDP uses the following parameters. If you enable IRDP on individual ports instead of enabling the
feature globally, you can configure these parameters on an individual port basis:
Changing the maximum number of ECMP (load sharing) paths
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 77
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