Allied Telesis AT-8824 Installationsanleitung Seite 22
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22 DHCP Option 82 Relay Release Note
Software Version 2.7.5
C613-10454-00 REV A
DHCP Option 82 Relay
The existing DHCP and BOOTP functionality has been enhanced to include the
addition, removal and monitoring of DHCP Option 82. Option 82 is also called
the Relay Agent Information option.
Option 82 is inserted by the DHCP relay agent into the DHCP options field
when forwarding client-originated BOOTP/DHCP packets to a DHCP server.
DHCP servers that are configured to recognise Option 82 may use the
information to implement IP addresses, or other parameter assignment
policies, based on the network location of the client device.
For more information about Option 82, see RFC 3046.
The BOOTP relay function has been enhanced. Option 82 can now be:
■ added to packets relayed from the DHCP client to DHCP server
■ removed from packets relayed from DHCP server to DHCP client
■ checked from sources closer to the client.
Additional commands have also been added to enable and disable Option 82.
Command changes
The following table summarises the new and modified commands (see
Command Reference Updates).
Command Change
purge bootp relay New result on entry of command.
show bootp relay New DHCP Option 82 fields Insertion status,
Check, Reforwarding policy and
Debugging
enable bootp relay option82 New command
disable bootp relay option82 New command
set bootp relay option82 New command
set bootp relay option82 port New command
show bootp relay port New command
- Software Version 2.7.5 1
- Overview of New Features 4
- MSS Clamping 5
- 8 MSS Clamping Release Note 8
- Software Version 2.7.5 9 9
- 10 MSS Clamping Release Note 10
- Syntax SHow PPP PPPoe 11
- Command changes 13
- Command Reference Updates 14
- Software Version 2.7.5 15 15
- Command Changes 18
- Syntax SHow IP 21
- DHCP Option 82 Relay 22
- Software Version 2.7.5 25 25
- Syntax SHow BOOTp RELAy 26
- IGMP Enhancements 28
- Filtering and Throttling 29
- Configuring IGMP 30
- IGMP Throttling 31
- Software Version 2.7.5 33 33
- Software Version 2.7.5 35 35
- OSPF Network Types 41
- [{FULl 45
- BGP Enhancements 46
- Automatic Summarising 48
- Aggregating Routes 50
- Software Version 2.7.5 53 53
- Syntax SHow BGP 55
- Syntax SHow BGP PEer[=ipadd] 56
- Software Version 2.7.5 59 59
- Software Version 2.7.5 61 61
- Firewall Enhancements 63
- UDP Port Timeout 65
- Software Version 2.7.5 67 67
- Software Version 2.7.5 73 73
- WAN Load Balancing 74
- VRRP Preemption Delay 75
- Software Version 2.7.5 77 77
- ..3600] [PRIOrity=1..254] 77
- Operating Principles 80
- Load Distribution Methods 81
- 1-4 Release Note 82
- WAN Load Balancing 1-5 83
- Healthcheck 84
- Assigning Weights 85
- Healthchecks 86
- Operation with Firewall 87
- 1-10 Release Note 88
- Before you 89
- Parameter Description 96
- ● eth (such as eth0, eth1) 100
- ● PPP (such as ppp0, ppp1) 100
- C613-10454-00 REV A 101
- Related Commands enable wanlb 109
- Syntax SHow WANLB 112
- Syntax SHow WANLB HEALthcheck 114
- ■ eth (such as eth0, eth1) 122
- ■ PPP (such as ppp0, ppp1) 122
- Filtering IP Routes 123
- 2-2 Release Note 124
- Introduction 125
- Types of Filters 126
- About AS Path Lists 127
- About Route Maps 127
- When to use 128
- About IP Route Filters 129
- Creating Filters 130
- Creating Route Maps for BGP 131
- How to create a route map 132
- ■ exclude the update message 133
- Example comparing 134
- AS path filter and 134
- Matching on 134
- Creating Route Maps for OSPF 138
- Creating IP Route Filters 141
- Applying Filters 142
- Applying AS path 143
- ■ prefix lists 148
- ■ AS path lists 148
- ■ route maps 148
- 2-28 Release Note 150
- [other-options] 150
- Filtering IP Routes 2-29 151
- The filtering 151
- Limitations of route 153
- Interface Routes 154
- Statically-Configured Routes 155
- Configuration Examples 156
- Using a Route Map 157
- Using an AS Path Filter 158
- Using Communities 160
- Command Reference 162
- Parameters for both 173
- Parameters for 173
- Parameters for set 176
- ■ an entire route map 181
- [PREfix=ipadd] 182
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