HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 60

Configuring ARP Parameters, How ARP Works

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IP Routing Features Configuring IP Parameters for Routing Switches priority than other configured interfaces.) However, you prefer, you can explicitly set the router ID to any valid IP address, as long as the IP address is not in use on another device in the network. Reconfiguring the Router ID (Optional). If you want to change the router ID setting, do the following: 1. Go to the global config context. When you do so, the CLI prompt will appear similar to the following: ProCurve(config)#_ 2. Use ip router-id < ip-addr > to specify a new router ID. (This IP address must be unique in the routing switch configuration.) For more information on the router ID, refer to "IP Global Parameters for Routing Switches" on page 3-8 and "Changing the Router ID" on page 3-13. To change the router ID, enter a command such as the following: ProCurve(config)# ip router-id 209.157.22.26 Syntax: Syntax: ip router-id < ip-addr > The < ip-addr > can be any valid, unique IP address. Note You can specify an IP address used for an interface on the ProCurve routing switch, but do not specify an IP address in use by another device. Configuring ARP Parameters Address Resolution Protocol (ARP) is a standard IP protocol that enables an IP routing switch to obtain the MAC address of another device's interface when the routing switch knows the IP address of the interface. ARP is enabled by default and cannot be disabled. How ARP Works A routing switch needs to know a destination's MAC address when forwarding traffic, because the routing switch encapsulates the IP packet in a Layer 2 packet (MAC layer packet) and sends the Layer 2 packet to a MAC interface on a device directly attached to the routing switch. The device can be the packet's final destination or the next-hop router toward the destination. 3-14

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IP Routing Features
Configuring IP Parameters for Routing Switches
priority than other configured interfaces.) However, you prefer, you can
explicitly set the router ID to any valid IP address, as long as the IP address
is not in use on another device in the network.
Reconfiguring the Router ID (Optional).
If you want to change the
router ID setting, do the following:
1.
Go to the global config context. When you do so, the CLI prompt will
appear similar to the following:
ProCurve(config)#_
2. Use
ip router-id <
ip-addr
>
to specify a new router ID. (This IP address must
be unique in the routing switch configuration.)
For more information on the router ID, refer to “IP Global Parameters for
Routing Switches” on page 3-8 and “Changing the Router ID” on page 3-13.
To change the router ID, enter a command such as the following:
ProCurve(config)# ip router-id 209.157.22.26
Syntax:
Syntax: ip router-id <
ip-addr
>
The
<
ip-addr
>
can be any valid, unique IP address.
Note
You can specify an IP address used for an interface on the ProCurve routing
switch, but do not specify an IP address in use by another device.
Configuring ARP Parameters
Address Resolution Protocol (ARP) is a standard IP protocol that enables an
IP routing switch to obtain the MAC address of another device’s interface
when the routing switch knows the IP address of the interface. ARP is enabled
by default and cannot be disabled.
How ARP Works
A routing switch needs to know a destination’s MAC address when forwarding
traffic, because the routing switch encapsulates the IP packet in a Layer 2
packet (MAC layer packet) and sends the Layer 2 packet to a MAC interface
on a device directly attached to the routing switch. The device can be the
packet’s final destination or the next-hop router toward the destination.
3-14