H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur télécharger pdf (Page 67)

Ste

Command

Remarks

8. Set the DSCP value

for SNMP responses.

snmp-agent packet response dscp

dscp-value

Optional.

By default, the DSCP value for SNMP

responses is 0.

Switching the NM-specific interface index format

A network management (NM)-specific ifindex identifies an interface and is provided by the SNMP

managed device to the NMS. A network management-specific ifindex takes one of the following two

formats:

• 16-bit NM-specific ifindex—The system dynamically assigns 16-bit NM-specific ifindex values to

uniquely identify its interfaces. The 16-bit NM-specific ifindex value starts from 1 and increments by

• 32-bit NM-specific ifindex—A 32-bit NM-specific ifindex value comprises an Offset, Interface Type,

Slot ID, and Chassis ID, as shown in Figure 23.

Figure 23 32-bit NM-sp

ecific ifindex

{ Offset—This field is 16 bits long and distinguishes different interfaces of the same type on the

same interface card.

{ Interface type—This field is 7 bits long and contains the enumerated value specific to the

interface type. It supports up to 128 different interface types and supports more than 80

interface types at present.

{ Slot ID—This field is 5 bits long and contains the number of the physical slot that holds the

interface.

Configuration guidelines

• Use the 32-bit NM-specific ifindex format if the NMS requires the format to get information such as

the slot that contains a specific interface. If the network protocol operating on the NMS does not

support 32-bit NM-specific ifindex values, make sure NM-specific ifindex values on the device are

16-bit. By default, the device adopts the 16-bit NM-specific ifindex format.

• If the device runs the version 5 or version 8 of NetStream, you must use the 16-bit format, because

the two NetStream versions reserve only 16 bits for the ifindex. NetStream version 9 reserves 32 bits

for the ifindex, so you can use either 16-bit or 32-bit NM-specific ifindex format.

• An NM-specific ifindex format change invalidates the NM-specific ifindex dependent settings, and

these settings cannot become valid until you switch the format back. To use these settings in the new

format, you must re-configure them. For example, if an RMON alarm group or private alarm group

has alarm variables in the format OID/variable-name.NM-specific-ifindex, you must reconfigure

these variables after an NM-specific ifindex format change.

Slot IDInterface Type

0 2215

Offset Chassis ID

27 31

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 103 104

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H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur Page 67

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