Users Guide

View configured static routes
OS10# show ip route static
Codes: C - connected
S - static
B - BGP, IN - internal BGP, EX - external BGP
O - OSPF,IA - OSPF inter area, N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, E1 - OSPF external type 1,
E2 - OSPF external type 2, > - non-active route
Gateway of last resort is not set
Destination Gateway Dist/Metric Last Change
------------------------------------------------------------------
S 200.200.200.0/24 via 10.1.1.2 ethernet1/1/1 0/0 00:00:03
OS10 installs a static route if the next hop is on a directly connected subnet. A next-hop that is not on the directly connected
subnet which recursively resolves to a next-hop on the interface's configured subnet also automatically configures. For example,
if interface ethernet 1/1/5 has IP address on subnet 100.0.0.0/8, and if 10.1.1.0/24 recursively resolves to 100.1.1.1, the
system installs the static route:
● When the interface goes down, OS10 withdraws the route.
● When the interface comes up, OS10 reinstalls the route.
● When the recursive resolution is broken, OS10 withdraws the route.
● When the recursive resolution is satisfied, OS10 reinstalls the route.
NOTE: The recursive next-hop resolution does not work when the interface involved is null 0.
Address Resolution Protocol
Address Resolution Protocol (ARP) runs over Ethernet and enables end stations to learn the MAC addresses of neighbors on an
IP network. Using ARP, OS10 automatically updates the ARP cache table that maps the MAC addresses to their corresponding
IP addresses. The ARP cache enables dynamically learned addresses to be removed after a time period you configure.
Configure static ARP entries
You can manually configure static entries in the ARP mapping table. Dynamic ARP is vulnerable to spoofing. To avoid spoofing,
configure static entries. Static entries take precedence over dynamic ARP entries.
NOTE:
In the default forwarding-table mode, the maximum number of ARP entries that are learnt over Layer3 port-
channels is limited to 32000. This restriction is applicable only to the Z9100 and S5200.
1. Configure an IP address and MAC address mapping for an interface in INTERFACE mode.
ip arp ip-address mac address
● ip-address—IP address in dotted decimal format in A.B.C.D format.
● mac address—MAC address in nnnn.nnnn.nnnn format
These entries do not age, and you can only remove them manually. To remove a static ARP entry, use the no arp ip-
address command.
Configure static ARP entries
OS10(config)# interface ethernet 1/1/6
OS10(conf-if-eth1/1/6)# ip arp 10.1.1.5 08:00:20:b7:bd:32
View ARP entries
OS10# show ip arp interface ethernet 1/1/6
Address Hardware address Interface Egress Interface
--------------------------------------------------------------
10.1.1.5 08:00:20:b7:bd:32 ethernet1/1/6 ethernet1/1/6
898
Layer 3