65
Parameters
ip-address
: Specifies the source IP address.
interface
interface-type interface-number
: Uses the IP address of an interface as the
source IP address. The
interface-type interface-number
arguments specify an interface
by its type and number.
Usage guidelines
This command is required if multiple relay interfaces share the same IP address or if a relay interface
does not have routes to DHCP servers. You can use this command to specify the IP address of
another interface, typically the loopback interface, on the DHCP relay agent as the source IP
address for DHCP requests. The relay interface inserts the source IP address in the source IP
address field as well as the
giaddr
field in DHCP requests.
If multiple relay interfaces share the same IP address, you must also configure the relay interface to
support Option 82. Upon receiving a DHCP request, the relay interface inserts the subnet
information in sub-option 5 in Option 82. The DHCP server assigns an IP address according to
sub-option 5. The DHCP relay agent looks the output interface up in the MAC address table to
forward the DHCP reply.
If you execute this command multiple times, the most recent configuration takes effect.
Examples
# Specify 1.1.1.1 as the source IP address for relayed DHCP requests on VLAN-interface 2.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] dhcp relay source-address 1.1.1.1
Related commands
dhcp select relay
dhcp smart-relay enable
Use
dhcp smart-relay enable
to enable the DHCP smart relay feature.
Use
undo dhcp smart-relay enable
to disable the DHCP smart relay feature.
Syntax
dhcp smart-relay enable
undo dhcp smart-relay enable
Default
The DHCP smart relay feature is disabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
The smart relay feature allows the relay agent to use secondary IP addresses as the gateway
address when the DHCP server does not reply the DHCP-OFFER message. The relay agent initially
inserts its primary IP address in the
giaddr
field before forwarding a request to the DHCP server. If
no DHCP-OFFER is returned after two retries, the relay agent switches to secondary IP addresses.
Without this feature, the relay agent always uses the primary IP address as the gateway address.
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Страница 114: ...ii tftp client ipv6 source 41 tftp client source 41 tftp ipv6 42 tftp server acl 44 tftp server ipv6 acl 44...
Страница 285: ...i Contents Tcl commands 1 cli 1 tclquit 1 tclsh 2...
Страница 288: ...i Contents Python commands 1 exit 1 python 1 python filename 2...
Страница 291: ...i Contents Automatic configuration commands 1 autodeploy udisk enable 1...
Страница 323: ...25 Sysname Ten GigabitEthernet1 0 51 undo shutdown Related commands irf port...
Страница 396: ...i Contents Bulk interface configuration commands 1 display interface range 1 interface range 1 interface range name 3...
Страница 460: ...i Contents Port isolation commands 1 display port isolate group 1 port isolate enable 2 port isolate group 2...
Страница 465: ...ii stp vlan enable 55 vlan mapping modulo 55...
Страница 589: ...60 Examples Enable LLDP for automatic IP phone discovery Sysname system view Sysname voice vlan track lldp...
Страница 602: ...12 Related commands display mvrp statistics...
Страница 609: ...i Contents VLAN mapping commands 1 display vlan mapping 1 vlan mapping 2...
Страница 678: ...9 Related commands reset pppoe relay statistics...
Страница 846: ...i Contents Basic IP forwarding commands 1 display fib 1 ip forwarding table save 2...
Страница 1073: ...i Contents HTTP redirect commands 1 http redirect https port 1 http redirect ssl server policy 1...
Страница 1087: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1340: ...9 Sysname ipv6 route static default preference 120 Related commands display ipv6 routing table protocol...
Страница 1649: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1668: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1770: ...i Contents Time range commands 1 display time range 1 time range 1...
Страница 2026: ...34 Related commands display mac authentication...
Страница 2028: ...ii...
Страница 2143: ...i Contents User profile commands 1 display user profile 1 user profile 2...
Страница 2308: ...61 ipsec transform set...
Страница 2473: ...i Contents TCP attack prevention commands 1 tcp anti naptha enable 1 tcp check state interval 1 tcp state 2...
Страница 2531: ...i Contents SAVI commands 1 ipv6 savi down delay 1 ipv6 savi log enable 1 ipv6 savi strict 2...
Страница 2534: ...3 Sysname ipv6 savi strict Related commands ipv6 verify source...
Страница 2541: ...i Contents Crypto engine commands 1 display crypto engine 1 display crypto engine statistics 1 reset crypto engine statistics 3...
Страница 2545: ...i Contents FIPS commands 1 display crypto version 1 display fips status 1 fips mode enable 2 fips self test 4...
Страница 2791: ...14 Sysname track 1 Related commands delay display track...
Страница 2939: ...9 sntp authentication keyid sntp reliable authentication keyid...
Страница 2967: ...27 Related commands apply poe profile poe enable poe max power interface view poe priority...
Страница 3240: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 3263: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...