VPRN Services Command Reference
Page 474 7705 SAR OS Services Guide
server
Syntax server server1 [server2...(up to 8 max)]
no server
Context config>service>vprn>if>dhcp
Description This command specifies a list of servers where requests will be forwarded. The list of servers can be
entered as either IP addresses or fully qualified domain names. There must be at least one server
specified for DHCP Relay to work. If there are multiple servers specified, the request is forwarded to
all of the servers in the list. There can be a maximum of 8 DHCP servers configured.
Default no server
Parameters server — the DHCP server IP address
trusted
Syntax [no] trusted
Context config>service>vprn>if>dhcp
Description This command enables or disables trusted mode on an IP interface.
According to RFC 3046, DHCP Relay Agent Information Option, a DHCP request where the gi-addr
(gateway interface address) is 0.0.0.0 and which contains an Option 82 field in the packet, should be
discarded, unless it arrives on a “trusted” circuit.
If trusted mode is enabled on an IP interface, the relay agent (the 7705 SAR) will modify the request's
gi-addr to be equal to the ingress interface and forward the request.
This behavior only applies when the action in the Relay Agent Information Option is “keep”.
In the case where the Option 82 field is being replaced by the relay agent (action = “replace”), the
original Option 82 information is lost. Thus, in this case, there is no reason for enabling the trusted
option.
The no form of this command returns the system to the default.
Default no trusted
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