Dell PowerConnect B-RX Configuration Manual page 269

BigIron RX(config)#ip route validate-nexthop-arp
Syntax: [no] ip route validate-nexthop-arp
Use the no form of the command to disable the ARP validation feature. When ARP validation is
disabled, the static route will be installed without checking the validity of the next hop.
Enabling the next hop validate ARP timer
The next hop validate ARP timer works only on the ARP entries created when the ARP validation
check feature has been enabled. The timer is used to age out the ARP entries when the next hop
goes down. All other ARP entries in the system, which are NOT created due to static routes, follow
the normal ARP age timer with default value of 3 minutes.
Use the ARP validation timer to reduce the response time where the static route with the next hop
down can be replaced quickly with a route with active next hop.
To set the ARP validation timer to 30 seconds, enter commnads such as the following.
BigIron RX(config)#ip route validate-nexthop-arp
BigIron RX(config)#ip route validate-nexthop-arp timer 30
Syntax: [no] ip route validate-nexthop-arp timer <value>
The default is 200 seconds.
The value parameter speocifies the amount of time before a nexthop down is replaced by an active
nexthop. Possible values are10-200 seconds.
Use the no form of the command to disable the validation timer.
Displaying the routes waiting for the next hop ARP to resolve
Use the following command to display which routes are waiting for the nexthop ARP to be resolved.
BigIron RX# show ip static route
IP Static Routing Table - 2 entries:
Type Codes: '*' - Installed, '+' - Waiting for ARP resolution
IP Prefix
*10.0.0.0/8
+20.1.1.0/24
*20.1.1.0/24
+20.1.1.0/24
20.1.1.0/24
Displaying ARP
When the next hop entry is a static route, enter the following command to display the route and the
timer value.
BigIron RX# show arp 10.43.14.1
Total number of ARP entries: 1
1
BigIron RX Series Configuration Guide
53-1002253-01
Next Hop
10.43.14.1
12.1.1.2
12.1.1.6
12.1.1.7
10.43.14.1
IP Address
10.43.14.1
ARP Debug Info
ArpIndex 0 InstId 16840 OutInt 2048 Vlan:0
HwMacIndex 0x0000ffff Router 0 PktCount 0
NumReq 0 ReplyTimeout 100
Interface Dis/Metric/Tag
1/1/0
1/1/0
1/1/0
5/1/0
MAC Address Type
00ab.cdef.0100 Dynamic
Configuring ARP parameters
10/1/0
Age Port
5 mgmt1
7
Status
Valid
193