Cisco 500 Series Administration Guide

IP Configuration
IPv4 Management and Interfaces
Cisco 500 Series Managed Switch Administration Guide 356
18
The following describes how DHCP request packets are handled when both
DHCP Snooping and DHCP Relay are enabled:
Option 82
Insertion
Disabled
Packet is sent
without Option
82
Packet is sent
with the
original
Option 82
Relay –
inserts Option
82
Bridge – no
Option 82 is
inserted
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
Option 82
Insertion
Enabled
Relay – is sent
with Option 82
Bridge – no
Option 82 is
sent
Packet is sent
with the
original
Option 82
Relay – is sent
with Option
82
Bridge – no
Option 82 is
sent
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
DHCP Relay
VLAN with IP Address
DHCP Relay
VLAN without IP Address
Packet arrives
without Option
82
Packet
arrives with
Option 82
Packet arrives
without
Option 82
Packet arrives
with Option
82
Option 82
Insertion
Disabled
Packet is sent
without Option
82
Packet is
sent with the
original
Option 82
Relay – inserts
Option 82
Bridge – no
Option 82 is
inserted
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
DHCP Relay
VLAN with IP Address
DHCP Relay
VLAN without IP Address

Cisco 500 Series Specifications

General

Model	Cisco 500 Series
Category	Switch
Mounting	Rack-mountable
Management	Web-based, CLI, SNMP
Ports	24, 48
Port Speed	10/100/1000 Mbps
PoE Support	Available on some models
Switching Capacity	Up to 176 Gbps
MAC Address Table Size	16, 000 entries
Security	ACLs, 802.1X
Quality of Service (QoS)	Yes
Dimensions	Varies by model
Weight	Varies by model
Humidity	10% to 90% non-condensing
Power Supply	Internal
Power Consumption	Varies by model
Jumbo Frame Support	Up to 9216 bytes