Arp Learning Via Gratuitous Arp - Dell Force10 S4810P Configuration Manual
High-density, 1ru 48-port 10gbe switch
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Also See for Force10 S4810P:
- Manual (60 pages) ,
- Quick start manual (27 pages) ,
- Reference manual (1637 pages)
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Clear ARP cache
To clear the ARP cache of dynamically learnt ARP information, use the following command in the EXEC
privilege mode:
Command Syntax
[
clear arp-cache
interface
ip-address] [ no-refresh ]
ARP Learning via Gratuitous ARP
Gratuitous ARP can mean an ARP request or reply. In the context of ARP Learning via Gratuitous ARP on
FTOS, the gratuitous ARP is a request. A Gratuitous ARP Request is an ARP request that is not needed
according to the ARP specification, but one that hosts may send to:
•
detect IP address conflicts
•
inform switches of their presence on a port so that packets can be forwarded
•
update the ARP table of other nodes on the network in case of an address change
In the request, the host uses its own IP address in the Sender Protocol Address and Target Protocol Address
fields.
In FTOS versions prior to 8.3.1.0, if a gratuitous ARP is received some time after an ARP request is sent,
only RP2 installs the ARP information. For example:
Command Mode
| ip
EXEC privilege
Purpose
Clear the ARP caches for all interfaces or for a specific
interface by entering the following information:
•
For a 1-Gigabit Ethernet interface, enter the keyword
followed by the slot/port information.
GigabitEthernet
•
For a port channel interface, enter the keyword
followed by a number from 1 to 255 for
port-channel
TeraScale and ExaScale, 1 to 32 for EtherScale.
•
For a SONET interface, enter the keyword
followed by the slot/port information.
•
For a 10-Gigabit Ethernet interface, enter the keyword
followed by the slot/port
TenGigabitEthernet
information.
•
For a VLAN interface, enter the keyword
by a number between 1 and 4094.
•
For a 40-Gigabit Ethernet interface, enter the keyword
followed by the slot/port information.
fortyGigE
ip ip-address (OPTIONAL) Enter the keyword ip followed by the
IP address of the ARP entry you wish to clear.
no-refresh
(OPTIONAL) Enter the keyword no-refresh to
delete the ARP entry from CAM. Or use this option with interface
or
ip ip-address to specify which dynamic ARP entries you want
to delete.
Note: Transit traffic may not be forwarded during the period
when deleted ARP entries are resolved again and re-installed
in CAM. Use this option with extreme caution.
sonet
followed
vlan
IPv4 Routing | 527
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Troubleshooting
