Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 27)

Here is an example of a static ARP entry.
Index IP Address MAC Address Port
1 10.95.6.111 0000.003b.d210 1/1
Each entry lists the information you specified when you created the entry.
IP route table
The IP route table contains paths to IP destinations.
NOTE
Layer 2 switches do not have an IP route table. A Layer 2 switch sends all packets addressed to
another subnet to the default gateway, which you specify when you configure the basic IP information
on the Layer 2 switch.
The IP route table can receive the paths from the following sources:
• A directly-connected destination, which means there are no router hops to the destination
• A static IP route, which is a user-configured route
• A route learned through RIP
• A route learned through OSPF
• A route learned through BGP4
The IP route table contains the best path to a destination:
• When the software receives paths from more than one of the sources listed above, the software
compares the administrative distance of each path and selects the path with the lowest
administrative distance. The administrative distance is a protocol-independent value from 1 through
255.
• When the software receives two or more best paths from the same source and the paths have the
same metric (cost), the software can load share traffic among the paths based on destination host or
network address (based on the configuration and the Layer 3 switch model).
Here is an example of an entry in the IP route table.
Destination NetMask Gateway Port Cost Type
10.1.0.0 255.255.0.0
10.1.1.2 1/1 2 R
Each IP route table entry contains the destination IP address and subnet mask and the IP address of
the next-hop router interface to the destination. Each entry also indicates the port attached to the
destination or the next-hop to the destination, the route IP metric (cost), and the type. The type indicates
how the IP route table received the route.
To increase the size of the IP route table for learned and static routes, refer to the section "Displaying
and modifying system parameter default settings" in the FastIron Ethernet Switch Platform and Layer 2
Switching Configuration Guide:
• For learned routes, modify theip-route parameter.
• For static routes, modify the ip-static-route parameter.
IP forwarding cache
The IP forwarding cache provides a fast-path mechanism for forwarding IP packets. The cache contains
entries for IP destinations. When a Brocade Layer 3 switch has completed processing and addressing
for a packet and is ready to forward the packet, the device checks the IP forwarding cache for an entry
to the packet destination:
IP route table
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 27
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