Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 108)

To modify the TTL threshold to 25, enter the following commands.
device(config)# ip ttl 25
device(config)# exit
Syntax: ip ttlttl-threshold
DHCP Assist configuration
DHCP Assist allows a BrocadeLayer 2 switch to assist a router that is performing multi-netting on its
interfaces as part of its DHCP relay function.
DHCP Assist ensures that a DHCP server that manages multiple IP subnets can readily recognize the
requester IP subnet, even when that server is not on the client local LAN segment. The BrocadeLayer
2 switch does so by stamping each request with its IP gateway address in the DHCP discovery packet.
NOTE
Brocade Layer 2 switches provide BootP/DHCP assistance by default on an individual port basis.
Refer to
Changing the IP address used for stamping BootP and DHCP requests on page 84.
By allowing multiple subnet DHCP requests to be sent on the same wire, you can reduce the number
of router ports required to support secondary addressing as well as reduce the number of DHCP
servers required, by allowing a server to manage multiple subnet address assignments.
FIGURE 11 DHCP requests in a network without DHCP Assist on the Layer 2 switch
In a network operating without DHCP Assist, hosts can be assigned IP addresses from the wrong
subnet range because a router with multiple subnets configured on an interface cannot distinguish
among DHCP discovery packets received from different subnets.
DHCP Assist configuration
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