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Configuring IP
December 2005
© Foundry Networks, Inc.
16 - 55
Figure 16.7
DHCP requests in a network with DHCP Assist operating on a FastIron
When the stamped DHCP discovery packet is then received at the router, it is forwarded to the DHCP server. The
DHCP server then extracts the gateway address from each request and assigns an available IP address within the
corresponding IP sub-net (Figure 16.8). The IP address is then forwarded back to the workstation that originated
the request.
NOTE:
The DHCP relay function of the connecting router needs to be turned on.
Server
Server
DHCP
Server
207.95.7.6
Host 1
200.95.6.x
Host 2
192.95.5.x
Sub-net 1
Host 3
Host 4
Router
202.95.1.x
Sub-net 3
Sub-net 2
Step 1:
DHCP IP address requests
for Hosts 1,2,3 and 4 in
Sub-nets 1, 2, 3 and 4
202.95.5.x
Sub-net 4
192.95.5.1
200.95.6.1
202.95.1.1
202.95.5.1
Step 2:
FastIron stamps each DHCP request
with the gateway address of the
corresponding subnet of the
receiving port.
Gateway addresses:
Step 3:
Router forwards the DHCP request to the
server without touching the gateway
address inserted in the packet by the switch
Interface 2
Interface 8
Interface 14
FESX
Hub
Summary of Contents for FastIron Edge Switch X424
Page 36: ...Foundry Configuration Guide for the FESX FSX and FWSX 2 12 Foundry Networks Inc December 2005...
Page 56: ...Foundry Configuration Guide for the FESX FSX and FWSX 3 20 Foundry Networks Inc December 2005...
Page 70: ...Foundry Configuration Guide for the FESX FSX and FWSX 4 14 Foundry Networks Inc December 2005...
Page 198: ...Foundry Configuration Guide for the FESX FSX and FWSX 8 38 Foundry Networks Inc December 2005...
Page 316: ...Foundry Configuration Guide for the FESX FSX and FWSX 12 26 Foundry Networks Inc December 2005...
Page 350: ...Foundry Configuration Guide for the FESX FSX and FWSX 15 12 Foundry Networks Inc December 2005...
Page 458: ...Foundry Configuration Guide for the FESX FSX and FWSX 18 18 Foundry Networks Inc December 2005...
Page 712: ...Foundry Configuration Guide for the FESX FSX and FWSX 22 32 Foundry Networks Inc December 2005...
Page 760: ...Foundry Configuration Guide for the FESX FSX and FWSX A 34 Foundry Networks Inc December 2005...
Page 796: ...Foundry Configuration Guide for the FESX FSX and FWSX C 18 Foundry Networks Inc December 2005...
Page 820: ...Foundry Configuration Guide for the FESX FSX and FWSX E 10 Foundry Networks Inc December 2005...