Connectivity Guide

View congured 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 congured subnet also automatically congures. 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 satised, OS10 reinstalls the route.
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 congure.
Congure static ARP entries
You can manually congure static entries in the ARP mapping table. Dynamic ARP is vulnerable to spoong. To avoid spoong, congure
static entries. Static entries take precedence over dynamic ARP entries.
1 Congure 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.
Congure 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
Protocol Address Hardware Interface Interface VLAN
----------------------------------------------------------------
Internet 10.1.1.5 08:00:20:b7:bd:32 ethernet1/1/6
IPv4 routing commands
390
Layer 3