Introduction DHCP Relay Agent
Software Reference for SwitchBlade x3100 Series Switches (Network Management)
7-4
FIGURE 7-2 DHCP Relay Agent
7.2.2.1 Client Requesting an IP Address (Dynamically Allocated)
The DHCP relay agent functionality allows the router to forward the request to a DHCP server on behalf of a
DHCP client on the same subnet as the router interface. When the DHCP Relay Agent receives a DHCP
packet from a client (configured as a CUSTOMER interface), the following sequence occurs:
1. The packet is discarded for the following conditions; otherwise it is forwarded.
• Option 82 has already been added to the packet.
= Physical Link (Network)
= Links
60
B
1
6
C
0.3
A
C
= Inband_MGT VLAN (60)
Set top box
PC PC
Set top box Set top boxSet top box
0.1
0.2
0.1
0.3
0.2
= Telesyn 9000
A
C
4
= Physical Link (Customer)
DHCP_logical_VLAN_60
= XE Interface
1
2.1
0.2
3
5
6
= GE Interface
20
40
60
60
20
40
2
20
= vlan_video
40
= vlan_data
= All VLANs map to one
DHCP Instance (with one
set of servers)
60
= Inband_MGMT
1
6.1
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