Foundry Configuration Guide for the FESX, FSX, and FWSX
16 - 46
© Foundry Networks, Inc.
December 2005
•
The MAC address of the boot client.
•
The IP address you want the Layer 3 Switch to give to the client.
When a client sends a RARP broadcast requesting an IP address, the Layer 3 Switch responds to the request by
looking in the RARP table for an entry that contains the client’s MAC address:
•
If the RARP table contains an entry for the client, the Layer 3 Switch sends a unicast response to the client
that contains the IP address associated with the client’s MAC address in the RARP table.
•
If the RARP table does not contain an entry for the client, the Layer 3 Switch silently discards the RARP
request and does not reply to the client.
How RARP Differs from BootP/DHCP
RARP and BootP/DHCP are different methods for providing IP addresses to IP hosts when they boot. These
methods differ in the following ways:
•
Location of configured host addresses
•
RARP requires static configuration of the host IP addresses on the Layer 3 Switch. The Layer 3 Switch
replies directly to a host’s request by sending an IP address you have configured in the RARP table.
•
The Layer 3 Switch forwards BootP and DHCP requests to a third-party BootP/DHCP server that
contains the IP addresses and other host configuration information.
•
Connection of host to boot source (Layer 3 Switch or BootP/DHCP server):
•
RARP requires the IP host to be directly attached to the Layer 3 Switch.
•
An IP host and the BootP/DHCP server can be on different networks and on different routers, so long as
the routers are configured to forward (“help”) the host’s boot request to the boot server.
•
You can centrally configure other host parameters on the BootP/DHCP server, in addition to the IP
address, and supply those parameters to the host along with its IP address.
To configure the Layer 3 Switch to forward BootP/DHCP requests when boot clients and the boot servers are on
different sub-nets on different Layer 3 Switch interfaces, see “Configuring BootP/DHCP Forwarding Parameters”
on page 16-49.
Disabling RARP
RARP is enabled by default. To disable RARP, enter the following command at the global CONFIG level:
FESX424 Router(config)# no ip rarp
Syntax:
[no] ip rarp
To re-enable RARP, enter the following command:
FESX424 Router(config)# ip rarp
Creating Static RARP Entries
You must configure the RARP entries for the RARP table. The Layer 3 Switch can send an IP address in reply to
a client’s RARP request only if create a RARP entry for that client.
To assign a static IP RARP entry for static routes on a Foundry router, enter a command such as the following:
FESX424 Router(config)# rarp 1 1245.7654.2348 192.53.4.2
This command creates a RARP entry for a client with MAC address 1245.7654.2348. When the Layer 3 Switch
receives a RARP request from this client, the Layer 3 Switch replies to the request by sending IP address
192.53.4.2 to the client.
Syntax:
rarp <number> <mac-addr>.<ip-addr>
The <number> parameter identifies the RARP entry number. You can specify an unused number from 1 to the
maximum number of RARP entries supported on the device. To determine the maximum number of entries
supported on the device, see the section “Displaying and Modifying System Parameter Default Settings” on
page 4-8.
Содержание FastIron Edge Switch X424
Страница 36: ...Foundry Configuration Guide for the FESX FSX and FWSX 2 12 Foundry Networks Inc December 2005...
Страница 56: ...Foundry Configuration Guide for the FESX FSX and FWSX 3 20 Foundry Networks Inc December 2005...
Страница 70: ...Foundry Configuration Guide for the FESX FSX and FWSX 4 14 Foundry Networks Inc December 2005...
Страница 198: ...Foundry Configuration Guide for the FESX FSX and FWSX 8 38 Foundry Networks Inc December 2005...
Страница 316: ...Foundry Configuration Guide for the FESX FSX and FWSX 12 26 Foundry Networks Inc December 2005...
Страница 334: ...Foundry Configuration Guide for the FESX FSX and FWSX 13 18 Foundry Networks Inc December 22 2005...
Страница 350: ...Foundry Configuration Guide for the FESX FSX and FWSX 15 12 Foundry Networks Inc December 2005...
Страница 458: ...Foundry Configuration Guide for the FESX FSX and FWSX 18 18 Foundry Networks Inc December 2005...
Страница 712: ...Foundry Configuration Guide for the FESX FSX and FWSX 22 32 Foundry Networks Inc December 2005...
Страница 760: ...Foundry Configuration Guide for the FESX FSX and FWSX A 34 Foundry Networks Inc December 2005...
Страница 796: ...Foundry Configuration Guide for the FESX FSX and FWSX C 18 Foundry Networks Inc December 2005...
Страница 820: ...Foundry Configuration Guide for the FESX FSX and FWSX E 10 Foundry Networks Inc December 2005...