Cisco 3020 - Catalyst Blade Switch Configuration Manual page 369

Cisco catalyst blade switch 3020 for hp software configuration guide, rel. 12.2(25)sef1
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Chapter 17
Configuring DHCP Features
In the port field of the circuit ID suboption, the port numbers start at 1. For example, on a Cisco Catalyst
Blade Switch 3020 for HP, which has 24 ports, port 1 is the Gigabit Ethernet 0/1 port, port 2 is the
Gigabit Ethernet 0/2 port, port 3 is the Gigabit Ethernet 0/3 port, and so on. Ports 17 to 20 are
dual-purpose SFP module/RJ-45 copper Ethernet uplink ports Gi0/17 to Gi0/20. Ports 21x and 22x are
copper 10/100/1000BASE-T ports Gi0/21 and Gi0/22. Ports 23x and 24x are dual-purpose
external/internal 10/100/1000BASE-T copper uplink ports Gi0/23 and Gi0/24.
Figure 17-2
switch uses the packet formats when you globally enable DHCP snooping and enter the ip dhcp
snooping information option global configuration command.
Figure 17-2
Circuit ID Suboption Frame Format
Suboption
type
1
1 byte
Remote ID Suboption Frame Format
Suboption
type
2
1 byte
Figure 17-2
switch uses these packet formats when DHCP snooping is globally enabled and when the ip dhcp
snooping information option format remote-id global configuration command and the ip dhcp
snooping vlan information option format-type circuit-id string interface configuration command are
entered.
The values for these fields in the packets change from the default values when you configure the
remote-ID and circuit-ID suboptions:
Circuit-ID suboption fields
OL-8915-01
Length of the suboption type
Remote-ID type
Length of the remote-ID type
shows the packet formats for the remote-ID suboption and the circuit-ID suboption. The
Suboption Packet Formats
Circuit
ID type
Length
Length
6
0
4
VLAN
1 byte 1 byte 1 byte
2 bytes
Remote
ID type
Length
Length
8
0
6
1 byte 1 byte 1 byte
shows the packet formats for user-configured remote-ID and circuit-ID suboptions The
The circuit-ID type is 1.
The length values are variable, depending on the length of the string that you configure.
Module Port
1 byte 1 byte
MAC address
6 bytes
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Understanding DHCP Features
17-5

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