ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv4 Interface
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clear arp-cache This command deletes all dynamic entries from the Address Resolution
Protocol (ARP) cache.
COMMAND MODE
Privileged Exec
EXAMPLE
This example clears all dynamic entries in the ARP cache.
Console#clear arp-cache
This operation will delete all the dynamic entries in ARP Cache.
Are you sure to continue this operation (y/n)?y
Console#
show arp This command displays entries in the Address Resolution Protocol (ARP)
cache.
COMMAND MODE
Normal Exec, Privileged Exec
COMMAND USAGE
◆ This command displays information about the ARP cache. The first line
shows the cache timeout. It also shows each cache entry, including the
IP address, MAC address, type (static, dynamic, other), and VLAN
interface. Note that entry type “other” indicates local addresses for this
router.
◆ You can define up to 128 static entries in the ARP cache.
◆ A static entry may need to be used if there is no response to an ARP
broadcast message. For example, some applications may not respond
to ARP requests or the response arrives too late, causing network
operations to time out.
◆ Static entries will not be aged out or deleted when power is reset. You
can only remove a static entry via the configuration interface.
◆ Static entries are only displayed for VLANs that are up. In other words,
static entries are only displayed when configured for the IP subnet of a
existing VLAN, and that VLAN is linked up.
EXAMPLE
This example displays all entries in the ARP cache.
Console#show arp
ARP Cache Timeout: 1200 (seconds)
IP Address MAC Address Type Interface
--------------- ----------------- --------- -----------
10.1.0.0 FF-FF-FF-FF-FF-FF other VLAN1
10.1.0.254 00-00-AB-CD-00-00 other VLAN1