No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Configuration Guide - Network Management and Monitoring

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, LLDP, NQA, Service Diagnosis, Mirroring, Packet Capture, sFlow, and NETCONF.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Understanding IOAM

Understanding IOAM

As shown in Figure 16-1, the IOAM system, the IOAM system consists of the following parts:

Figure 16-1 Network diagram of the IOAM system
  • Ingress node: Collects and copies service packets, adds OAM information to the copied packets, and then forwards the packets.
  • Transit node: Forwards IOAM packets and adds OAM information about the local hop to the packets.
  • Egress node: Sends the received IOAM packets to the analyzer for analysis.
  • Analyzer: Collects IOAM packets and analyzes the network status based on the OAM information carried in the packets.
NOTE:

When the outbound interface of the route from the egress node to the analyzer is a Layer 3 sub-interface, IOAM packets cannot be sent to the analyzer.

After collecting and copying service packets, the ingress node sends the packets to the analyzer through one or more transit nodes and the egress node. When a packet passes through each hop, OAM information about the hop is added to the packet.

Currently, IOAM can be used to copy TCP, UDP, and VXLAN packets and add OAM information. Figure 16-2 shows the IOAM packet format.
Figure 16-2 IOAM packet format

The OAM HDR is the header of an IOAM packet, and the MD is the data added for each hop. Figure 16-3 and Figure 16-4 show the formats of the OAM HDR and MD in an IOAM packet, respectively.

Figure 16-3 Format of the OAM HDR
Table 16-1 Description of fields in the OAM HDR

Field

Length

Description

Header

64 bits

Header ID.

Version

8 bits

Version number. The value is 0x01.

Message Type

8 bits

Information type. The value is 0x01.

Flags

16 bits

Flag bit.

Telemetry Request Vector

32 bits

MD ID. The value is 0xFFFFFFFF.

Hop Limit

8 bits

Maximum number of hops that a packet can pass through. The value is 8.

Hop Count

8 bits

Number of hops that a packet has passed through.

Maximum Length

16 bits

Maximum MD length. The value is 256 bytes.

Current Length

16 bits

Current MD length, in bytes.

Sender's Handle

16 bits

ID set by the sender.

Sequence Number

16 bits

Packet sequence number.

Figure 16-4 Format of the MD
Table 16-2 Description of fields in the MD

Field

Length

Description

Device ID

32 bits

Node ID.

Template ID

3 bits

Packet template ID.

Congestion

5 bits

Packet congestion flag. Currently, this field is not supported.

Egress Port Drop Pkt Byte Cnt Upper

8 bits

This field is used with Egress Port Drop Pkt Byte Cnt to indicate the number of discarded packets on the outbound interface. Currently, this field is not supported.

IP_TTL

8 bits

TTL value of a packet.

Queue_id

8 bits

Queue ID.

Rx Timestamp Seconds Upper

32 bits

Timestamp when a packet is received, in seconds.

Rx Timestamp Seconds

16 bits

Rx Timestamp Nano-Seconds Upper

16 bits

Timestamp when a packet is received, in nanoseconds.

Rx Timestamp Nano-Seconds

16 bits

Tx Timestamp Nano-Seconds Upper

16 bits

Timestamp when a packet is sent, in nanoseconds.

Tx Timestamp Nano-Seconds

16 bits

Egress Port Utilization [%]

16 bits

Bandwidth usage of the outbound interface.

Ingress Port [module, port]

16 bits

Inbound interface of a packet, including the chip ID and interface number.

Egress Port [module, port]

16 bits

Outbound interface of a packet, including the chip ID and interface number.

Egress Port Drop Pkt Byte Cnt

32 bits

This field is used with Egress Port Drop Pkt Byte Cnt Upper to indicate the number of discarded packets on the outbound interface. Currently, this field is not supported.

Translation
Download
Updated: 2019-04-20

Document ID: EDOC1100075344

Views: 28710

Downloads: 29

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next