Example for Configuring Frame DM for a Bidirectional LSP

This section provides an example for configuring frame delay measurement (DM) for a bidirectional label switched path (LSP).

Networking Requirements

As a connection-oriented packet switching technology, Multiprotocol Label Switching Transport Profile (MPLS-TP) is designed to convert a circuit switched transport network to a packet switched transport network. The purpose is to increase the transmission rate on the transport network.

Link reliability must be ensured when MPLS-TP is used. Voice services are used as an example. The coding and decoding of voice packets plus the transmission delay make the delay in VoIP transmission much longer than that in common circuit switched voice transmission. If the delay is longer than 400 ms, the voice quality is affected. If the delay is longer than 2 seconds, VoIP services are unavailable. In addition, if the delay variation (jitter) is longer than the transmission duration of a voice packet, voice quality will drop greatly.

Frame DM can be used to collect delay and jitter statistics and evaluate link performance. DM is a performance monitoring function provided by MPLS-TP and is classified as one-way frame DM or two-way frame DM.

The configuration of two-way frame DM is used as an example in this section. Regardless of one-way or two-way, DM configurations on LSRs are the same except the statistics display configurations.

On the network shown in Figure 1, a bidirectional LSP is established to connect label switching routers (LSRs) A, B, and C. The following deployment is made to ensure the connectivity between LSRA and LSRC:

LSRA and LSRC serve as MEPs.
LSRB serves as a MIP.

Figure 1 Bidirectional LSP

Interfaces 1 through 2 in this example are GE 0/1/0 and GE 0/1/8, respectively.

**Table 1** Interfaces and IP addresses
Device	Interface	IP Address
LSRA	Loopback1	1.1.1.1/32
LSRA	GigabitEthernet0/1/0	2.1.1.1/24
LSRB	Loopback1	2.2.2.2/32
	GigabitEthernet0/1/0	2.1.1.2/24
	GigabitEthernet0/1/8	3.2.1.1/24
LSRC	Loopback1	3.3.3.3/32
LSRC	GigabitEthernet0/1/8	3.2.1.2/24

Configuration Roadmap

The configuration roadmap is as follows:

Create a maintenance entity (ME) instance and bind it to a bidirectional LSP.
(Optional) Configure an interval at which CCMs are sent and a priority for CCMs.
Enable continuity check (CC) and connectivity verification (CV) on the MEP and its remote MEP (RMEP).
Enable two-way frame DM.

Data Preparation

To complete the configuration, you need the following data:

MEG name
Name of the tunnel interface to which an ME instance is bound

Procedure

Configure a bidirectional LSP.
For configuration details, see "Example for Configuring a Static Bidirectional Co-routed CR-LSP" in HUAWEI NetEngine 8000 F SeriesRouter Configuration Guide - MPLS or "Configuration Files" in this section.

Create an ME instance and bind it to the bidirectional LSP.

# Create an ME instance named test on LSRA and bind it to Tunnel 10.

[~LSRA] mpls-tp meg test
[~LSRA-mpls-tp-meg-test] me te interface Tunnel 10 mep-id 1 remote-mep-id 2
[*LSRA-mpls-tp-meg-test] commit

# Create an ME instance named test on LSRC and bind it to Tunnel 20.

[~LSRC] mpls-tp meg test
[~LSRC-mpls-tp-meg-test] me te interface Tunnel 20 mep-id 2 remote-mep-id 1
[*LSRC-mpls-tp-meg-test] commit

(Optional) Configure an interval at which CCMs are sent and a priority for CCMs.

The same interval at which CCMs are sent and priority of CCMs must be configured on the MEP and RMEP. If the configurations at both ends are different, an alarm indicating an error is reported.
# Set the interval at which CCMs are sent to 100 ms and the priority of CCMs to 6 on LSRA.
```
[~LSRA-mpls-tp-meg-test] cc interval 100
[*LSRA-mpls-tp-meg-test] cc exp 6
[*LSRA-mpls-tp-meg-test] commit
```
# Set the interval at which CCMs are sent to 100 ms and the priority of CCMs to 6 on LSRC.
```
[~LSRC-mpls-tp-meg-test] cc interval 100
[*LSRC-mpls-tp-meg-test] cc exp 6
[*LSRA-mpls-tp-meg-test] commit
```

Enable CC and CV.

# Enable CC and CV on LSRA.

[~LSRA-mpls-tp-meg-test] cc send enable
[*LSRA-mpls-tp-meg-test] cc receive enable
[*LSRA-mpls-tp-meg-test] return

# Enable CC and CV on LSRC.

[~LSRC-mpls-tp-meg-test] cc send enable
[*LSRC-mpls-tp-meg-test] cc receive enable
[*LSRA-mpls-tp-meg-test] commit

Enable two-way frame DM.

[~LSRA-mpls-tp-meg-test] delay-measure two-way
Two-way delay measure statistics      
delay(us):        delay variation(us):
182               --
182               0                 
182               0                 
183               1                 
182               1                 
The Max delay:183, The Max delay variation:1                         
The Min delay:182, The Min delay variation:0                         
The delay average:182, The delay variation average:1                         
Total sent Packets Number:5, Total received Packets Number: 5

Configuration Files

LSRA configuration file

#
 sysname LSRA
#
 mpls lsr-id 1.1.1.1
 mpls
  mpls te
#
 bidirectional static-cr-lsp ingress Tunnel10
  forward nexthop 2.1.1.2 out-label 20
  backward in-label 20
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 2.1.1.1 255.255.255.0
 mpls
 mpls te
#
interface LoopBack1
 ip address 1.1.1.1 255.255.255.255
#
interface Tunnel10
 ip address unnumbered interface LoopBack1
 tunnel-protocol mpls te
 destination 3.3.3.3
 mpls te signal-protocol cr-static
 mpls te tunnel-id 100
 mpls te bidirectional
#
 ip route-static 2.2.2.2 255.255.255.255 2.1.1.2
 ip route-static 3.3.3.3 255.255.255.255 2.1.1.2
#
 mpls-tp meg test
  me te interface Tunnel10 mep-id 1 remote-mep-id 2
  cc send enable
  cc receive enable
#
return

LSRB configuration file

#
 sysname LSRB
#
 mpls lsr-id 2.2.2.2
 mpls
  mpls te
#
 bidirectional static-cr-lsp transit lsp1
  forward in-label 20 nexthop 3.2.1.2 out-label 40
  backward in-label 16 nexthop 2.1.1.1 out-label 20
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 2.1.1.2 255.255.255.0
 mpls
 mpls te
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 3.2.1.1 255.255.255.0
 mpls
 mpls te
#
interface LoopBack1
 ip address 2.2.2.2 255.255.255.255
#
 ip route-static 1.1.1.1 255.255.255.255 2.1.1.1
 ip route-static 3.3.3.3 255.255.255.255 3.2.1.2
#
return

LSRC configuration file

#
 sysname LSRC
#
 mpls lsr-id 3.3.3.3
 mpls
  mpls te
#
 bidirectional static-cr-lsp egress lsp1
  forward in-label 40 lsrid 1.1.1.1 tunnel-id 100
  backward nexthop 3.2.1.1 out-label 16
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 3.2.1.2 255.255.255.0
 mpls
 mpls te
#
interface LoopBack1
 ip address 3.3.3.3 255.255.255.255
#
interface Tunnel20
 ip address unnumbered interface LoopBack1
 tunnel-protocol mpls te
 destination 1.1.1.1
 mpls te signal-protocol cr-static
 mpls te tunnel-id 200
 mpls te passive-tunnel
 mpls te binding bidirectional static-cr-lsp egress lsp1 
#
 ip route-static 1.1.1.1 255.255.255.255 3.2.1.1
 ip route-static 2.2.2.2 255.255.255.255 3.2.1.1
#
 mpls-tp meg test
  me te interface Tunnel20 mep-id 2 remote-mep-id 1
  cc send enable
  cc receive enable
#
return