R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

241
• You can specify up to 20 destination servers on an interface.
To configure broadcast UDP helper:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enable UDP helper.
udp-helper enable The default setting is disabled.
3. Enable the forwarding of
packets with the specified
UDP port.
udp-helper port { port-number | dns |
netbios-ds | netbios-ns | tacacs | tftp
| time }
No UDP port is specified by
default.
4. Enter interface view.
interface interface-type
interface-number
N/A
5. Specify a destination server.
udp-helper server ip-address
No destination server is
specified by default.
Configuring multicast UDP helper
When you configure multicast UDP helper, follow these guidelines:
• By default, some devices that support the directed broadcasts suppression function reject all
directional broadcast packets. Therefore, execute the ip forward-broadcast command and then you
can enable UDP helper. For more information about the directed broadcasts suppression function,
see "Configuring IP performance optimization."
• You can specify up to 50 mappings between multicast addresses and subnet broadcast addresses.
• You can specify an ACL for identifying UDP packets. Only packets permitted by the ACL can be
relayed.
To configure multicast UDP helper:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enable UDP helper.
udp-helper enable Disabled by default.
3. Enable the forwarding of
packets with the specified
UDP port.
udp-helper port { port-number | dns |
netbios-ds | netbios-ns | tacacs | tftp
| time }
No UDP port is specified by
default.
4. Enter interface view.
interface interface-type
interface-number
N/A
5. Specify a mapping between
a multicast address and a
broadcast address.
udp-helper multicast-map
group-address broad-address [ acl
acl-number ]
No multicast mapping is
specified by default.