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For two-way (round-trip) Ethernet frame delay measurement, either MEP can send a
request to begin a two-way delay measurement to its peer MEP, which responds with
timestamp information. Run-time statistics are collected and displayed at the initiator
MEP. The clocks do not need to be synchronized at the transmitting and receiving MEPs.
The Junos OS supports the optional timestamps in delay measurement reply (DMR)
frames to increase the accuracy of delay calculations. The Junos OS also supports
hardware-assisted timestamping for Ethernet frame delay protocol data units (PDUs)
in the reception path.
Use the show commands at the initiator MEP to display two-way delay statistics, and at
the receiver MEP to display one-way delay statistics.
The following are some limitations with regard to using Ethernet frame delay
measurement:
•
This feature is available only on MX Series routers.
•
Ethernet frame delay measurements are available only when the distributed periodic
packet management daemon (ppmd) is enabled.
•
The statistics collected are lost after graceful Routing Engine switchover (GRES).
•
You can monitor only one session to the same remote MEP or MAC address.
•
Accuracy is compromised when the system changes (such as from reconfiguration).
We recommend performing Ethernet frame delay measurements on a stable system.
•
The use of Ethernet frame delay measurements on aggregated Ethernet and pseudowire
interfaces is not supported.
•
The use of hardware-assisted timestamping is not supported on all MX DPCs (Rev-B
or higher is required).
•
If you attempt to perform Ethernet frame delay measurements to a non-MX partner,
the incoming Ethernet frame delay PDUs are discarded silently. Ethernet delay
measurement commands and capabilities are not available on non-MX Series routers.
Related
Documentation
Ethernet OAM•
• Configuring MEP Interfaces to Support ETH-DM on page 128
• Triggering an ETH-DM Session on page 129
• Viewing ETH-DM Statistics on page 130
• Configuring One-Way ETH-DM with Single-Tagged Interfaces on page 131
• Configuring Two-Way ETH-DM with Single-Tagged Interfaces on page 136
• Configuring ETH-DM with Untagged Interfaces on page 140
127Copyright © 2013, Juniper Networks, Inc.
Chapter 11: ITU-T Y.1731 Ethernet Frame Delay Measurements
- Published: 2013-02-13 1
- END USER LICENSE AGREEMENT 2
- Abbreviated Table of Contents 3
- Table of Contents 5
- Part 4 Index 8
- List of Figures 9
- List of Tables 11
- About This Guide 13
- Objectives 14
- Audience 14
- Supported Routing Platforms 15
- Using the Indexes 15
- Documentation Conventions 16
- Table 1: Notice Icons 17
- Documentation Feedback 18
- Requesting Technical Support 18
- Opening a Case with JTAC 19
- Overview 21
- Ethernet Terms and Acronyms 23
- 192.168.27.48 28
- 0x8100. This is not the VLAN 31
- Layer 2 Networking Standards 37
- CHAPTER 2 41
- Example Scenario 43
- Example Configuration Summary 44
- Configure MSTP on Router 3: 53
- Virtual Switches 59
- Chapter 3: Virtual Switches 61
- Environments 63
- Configuring a Normalized VLAN 66
- CHAPTER 5 83
- Protocols 87
- CHAPTER 7 99
- • DHCP Relay Agent 102
- Interworking Function 103
- Router PE2 107
- Configuration 107
- Router PE1 109
- • ATM Ethernet Interworking 117
- Layer 2 Firewall Filters 121
- • Layer 2 Firewall Filters 128
- Management 129
- Configuration of P 136
- MPLS only, no CFM needed: 136
- CFM on PE1 [edit interfaces] 139
- CFM on PE2 [edit interfaces] 140
- Documentation 141
- Ethernet OAM• 141
- • Ethernet OAM 143
- Measurements 145
- Single-Tagged Interfaces 151
- Configuration on Router MX-1: 152
- Configuration on Router MX-2: 152
- MX-1 and MX-2 160
- IEEE 802.3ah OAM Link-Fault 163
- Ethernet Ring Protection 171
- Example Topology 174
- 1. Configure the interfaces: 175
- Configure Ethernet OAM: 176
- Router 2 Configuration 177
- Router 3 Configuration 178
- Configure the bridge domain: 179
- Requirements 181
- Overview and Topology 181
- MX Series Routers 182
- SettingsProperty 183
- Configuring ERP on CS2 187
- Configuring ERP on AS1 190
- Verification 192
- Verifying the VLANs on CS1 194
- Verifying the VLANs on CS2 195
- Verifying the VLANs on AS1 197
- Index on page 185 203
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