
C
HAPTER
14
| Basic Administration Protocols
Ethernet Ring Protection Switching
– 496 –
blocking the RPL. Each link is monitored by its two adjacent nodes using
Connectivity Fault Management (CFM) protocol messages.
Protection switching (opening the RPL to traffic) occurs when a signal
failure message generated by the Connectivity Fault Management (CFM)
protocol is declared on one of the ring links, and the detected failure has a
higher priority than any other request; or a Ring – Automatic Protection
Switching protocol request (R-APS, as defined in Y.1731) is received which
has a higher priority than any other local request.
A link/node failure is detected by the nodes adjacent to the failure. These
nodes block the failed link and report the failure to the ring using R-APS
(SF) messages. This message triggers the RPL owner to unblock the RPL,
and all nodes to flush their forwarding database. The ring is now in
protection state, but it remains connected in a logical topology.
When the failed link recovers, the traffic is kept blocked on the nodes
adjacent to the recovered link. The nodes adjacent to the recovered link
transmit R-APS (NR - no request) message indicating they have no local
request. When the RPL owner receives an R-APS (NR) message it starts the
Wait-To-Recover (WTR) timer. Once WTR timer expires, the RPL owner
blocks the RPL and transmits an R-APS (NR, RB - ring blocked) message.
Nodes receiving this message flush the forwarding database and unblock
their previously blocked ports. The ring is now returned to Idle state.
Figure 284: ERPS Ring Components
Multi-ring/Ladder Network – ERPSv2 also supports multipoint-to-multipoint
connectivity within interconnected rings, called a “multi-ring/ladder
network” topology. This arrangement consists of conjoined rings connected
by one or more interconnection points, and is based on the following
criteria:
◆
The R-APS channels are not shared across Ethernet Ring
interconnections.
◆
On each ring port, each traffic channel and each R-APS channel are
controlled (e.g., for blocking or flushing) by the Ethernet Ring
Protection Control Process (ERP Control Process) of only one ring.
◆
Each Major Ring or Sub-Ring must have its own RPL.
E
ast
Port
W
est
Port
RPL Owner
CC
M
essages
RPL
x
CC
M
essages
(
I
d
l
e
State)
Содержание ECS4110-28T
Страница 1: ...Management Guide www edge core com ECS4110 28T 28P 52T 52P 28 52 Port Gigabit Ethernet Layer 2 Switch...
Страница 2: ......
Страница 4: ......
Страница 63: ...FIGURES 63 Figure 428 Configuring VLAN Translation 1177...
Страница 64: ...FIGURES 64...
Страница 72: ...TABLES 72...
Страница 74: ...SECTION I Getting Started 74...
Страница 102: ...SECTION II Web Configuration 102 General IP Routing on page 679...
Страница 154: ...CHAPTER 4 Basic Management Tasks Resetting the System 154...
Страница 198: ...CHAPTER 5 Interface Configuration VLAN Trunking 198 Figure 65 Configuring VLAN Trunking...
Страница 272: ...CHAPTER 9 Congestion Control Automatic Traffic Control 272...
Страница 286: ...CHAPTER 10 Class of Service Layer 3 4 Priority Settings 286...
Страница 420: ...CHAPTER 13 Security Measures DHCP Snooping 420...
Страница 566: ...CHAPTER 14 Basic Administration Protocols OAM Configuration 566...
Страница 638: ...CHAPTER 15 Multicast Filtering Multicast VLAN Registration for IPv6 638...
Страница 662: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 662...
Страница 678: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 678...
Страница 792: ...CHAPTER 21 System Management Commands Switch Clustering 792...
Страница 822: ...CHAPTER 23 Remote Monitoring Commands 822...
Страница 888: ...CHAPTER 24 Authentication Commands PPPoE Intermediate Agent 888...
Страница 968: ...CHAPTER 25 General Security Measures Port based Traffic Segmentation 968...
Страница 994: ...CHAPTER 26 Access Control Lists ACL Information 994...
Страница 1034: ...CHAPTER 28 Link Aggregation Commands Trunk Status Display Commands 1034...
Страница 1044: ...CHAPTER 29 Power over Ethernet Commands 1044...
Страница 1084: ...CHAPTER 33 UniDirectional Link Detection Commands 1084...
Страница 1090: ...CHAPTER 34 Address Table Commands 1090...
Страница 1194: ...CHAPTER 37 VLAN Commands Configuring Voice VLANs 1194...
Страница 1388: ...CHAPTER 42 CFM Commands Delay Measure Operations 1388...
Страница 1410: ...CHAPTER 44 Domain Name Service Commands 1410...
Страница 1420: ...CHAPTER 45 DHCP Commands DHCP Relay 1420...
Страница 1472: ...CHAPTER 46 IP Routing Commands IPv4 Commands 1472...
Страница 1474: ...SECTION IV Appendices 1474...
Страница 1502: ...COMMAND LIST 1502...
Страница 1513: ......
Страница 1514: ...ECS4110 28T ECS4110 28P ECS4110 52T ECS4110 52P E072014 ST R02 150200000929A...