BigIron RX Series Configuration Guide 15353-1001986-01The IP packet flow 7The software places an entry from the static ARP table into the ARP cache when the entry’sinterface comes up.Here is an example of a static ARP entry.Index IP Address MAC Address Port1 207.95.6.111 0800.093b.d210 1/1Each entry lists the information you specified when you created the entry.To display ARP entries, refer to the following:• “Displaying the ARP cache” on page 222• “Displaying the static ARP table” on page 224To configure other ARP parameters, refer to “IP fragmentation protection” on page 184.To increase the size of the ARP cache and static ARP table, see the following:• For dynamic entries, refer to “Displaying and modifying system parameter default settings” onpage 131. The ip-arp parameter controls the ARP cache size.• For static entries, refer to “Changing the maximum number of entries the static ARP table canhold” on page 190. The ip-static-arp parameter controls the static ARP table size.IP Route tableThe IP route table contains paths to IP destinations.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 BGP4The IP route table contains the best path to a destination:• When the software receives paths from more than one of the sources listed above, thesoftware compares the administrative distance of each path and selects the path with thelowest administrative distance. The administrative distance is a protocol-independent valuefrom 1 – 255.• When the software receives two or more best paths from the same source and the paths havethe same metric (cost), the software can load share traffic among the paths based on Layer 2,Layer 3 and TCP/UDP information.Here is an example of an entry in the IP route table.Each IP route table entry contains the destination’s IP address and subnet mask and the IPaddress of the next-hop router interface to the destination. Each entry also indicates the portattached to the destination or the next-hop to the destination, the route’s IP metric (cost), and thetype. The type indicates how the IP route table received the route.To display the IP route table, refer to “Displaying the IP route table” on page 226.Destination NetMask Gateway Port Cost Type1.1.0.0 255.255.0.0 99.1.1.2 1/1 2 R
