Bootp/Dhcp Relay Agent - Dell PowerConnect 6224 User Manual

– Timed Out—The previous graceful restart timed out.
– Topology Changed— The previous graceful restart terminated prematurely because of a topology
change.
If you change the Support Mode, click Submit to save your change.
Click Refresh to redisplay the page with the latest values from the switch.
Enabling the NSF OSPF Graceful Restart Using CLI Commands
For information about the CLI command that performs this function, see the following chapter in the
CLI Reference Guide:
• OSPF Commands
The following table summarizes the equivalent CLI commands for this feature.
Table 9-19. NSF OSPF Graceful Restart Command
CLI Command
nsf
nsf helper
nsf helper strict-lsa-checking
show ip ospf
show ip ospf neighbor

BOOTP/DHCP Relay Agent

BootP/DHCP Relay Agent enables BootP/DHCP clients and servers to exchange BootP/DHCP messages
across different subnets. The relay agent receives the requests from the clients, and checks the valid hops
and giaddr fields. If the number of hops is greater than the configured, the agent assumes the packet is
looped through the agents and discards the packet. If giaddr field is zero the agent must fill in this field
with the IP address of the interface on which the request was received. The agent unicasts the valid
packets to the next configured destination. The server responds with a unicast BOOTREPLY addressed
to the relay agent closest to the client as indicated by giaddr field. Upon reception of the BOOTREPLY
from the server, the agent forwards this reply as broadcast or unicast on the interface form where the
BOOTREQUEST was arrived. This interface can be identified by giaddr field.
T he PowerConnect 6200 Series DHCP component also supports DHCP relay agent options to identify
the source circuit when customers are connected to the Internet with high-speed modem. The relay
agent inserts these options when forwarding the request to the server and removes them when sending
the reply to the clients.
If an interface has more than one IP address, the relay agent should use the primary IP address
configured as its relay agent IP address.
Description
Enables non-stop forwarding.
Enables helpful neighbor functionality for the OSPF protocol.
Requires that an OSPF helpful neighbor exit helper mode whenever a
topology change occurs.
Displays information relevant to the OSPF router.
This command displays information about OSPF neighbors.
Configuring Routing
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