Configuring Dhcp/Bootp Relay; Verifying The Dhcp/Bootp Relay Configuration; Udp-Forwarding - Extreme Networks Summit 200-24 Installation And User Manual

IP Unicast Routing

Configuring DHCP/BOOTP Relay

Once IP unicast routing is configured, you can configure the switch to forward Dynamic Host
Configuration Protocol (DHCP) or BOOTP requests coming from clients on subnets being serviced by
the switch and going to hosts on different subnets. This feature can be used in various applications,
including DHCP services between Windows NT servers and clients running Windows 95. To configure
the relay function, follow these steps:
1 Configure VLANs and IP unicast routing.
2 Enable the DHCP or BOOTP relay function, using the following command:
enable bootprelay
3 Configure the addresses to which DHCP or BOOTP requests should be directed, using the following
command:
config bootprelay add <ipaddress>
To delete an entry, use the following command:
config bootprelay delete {<ipaddress> | all}

Verifying the DHCP/BOOTP Relay Configuration

To verify the DHCP/BOOTP relay configuration, use the following command:
show ipconfig
This command displays the configuration of the BOOTP relay service, and the addresses that are
currently configured.

UDP-Forwarding

UDP-forwarding is a flexible and generalized routing utility for handling the directed forwarding of
broadcast UDP packets. UDP-forwarding allows applications, such as multiple DHCP relay services
from differing sets of VLANs, to be directed to different DHCP servers. The following rules apply to
UDP broadcast packets handled by this feature:
• If the UDP profile includes BOOTP or DHCP, it is handled according to guidelines in RFC 1542.
• If the UDP profile includes other types of traffic, these packets have the IP destination address
modified as configured, and changes are made to the IP and UDP checksums and decrements to the
TTL field, as appropriate.
If the UDP-forwarding is used for BOOTP or DHCP forwarding purposes, do not configure or use the
existing function. However, if the previous
bootprelay
continue to use them.
NOTE
UDP-forwarding only works across a layer 3 boundary.
190
functions are adequate, you may
bootprelay
Summit 200 Series Switch Installation and User Guide