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25-3
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 25 CE-1000-4 Ethernet Operation
Autonegotiation and Frame Buffering
Note Many Ethernet attributes are also available through the network element (NE) defaults feature. For more
information on NE defaults, refer to the "Network Element Defaults" appendix in the Cisco ONS 15454
Reference Manual or the Cisco ONS 15454 SDH Reference Manual.
Autonegotiation and Frame Buffering
On the CE-1000-4 card, Ethernet link autonegotiation is on by default. You can also enable and disable
autonegotiation under the card-level Provisioning tab of CTC.
The CE-1000-4 supports field-programmable gate array (FPGA) buffering to reduce data traffic
congestion. FPGA buffering supports SONET/SDH oversubscription. When the buffer nears capacity,
the CE-1000-4 card uses IEEE
802.3x flow control to transmit a pause frame to the attached Ethernet
device. Flow control and autonegotiation frames are local to the Gigabit Ethernet interfaces and the
attached Ethernet devices. These frames do not continue through the POS ports.
Flow Control
The CE-1000-4 supports IEEE 802.3x flow control and allows you to enable symmetric flow control,
enable asymmetric flow control, or to disable flow control. The configuration is done in CTC at the port
level.
By default the CE-1000-4 card uses symmetric flow control and only proposes symmetric flow control
when autonegotiating flow control with attached Ethernet devices. Symmetric flow control allows the
CE-1000-4 cards to respond to pause frames sent from external devices and to send pause frames to
external devices.
The pause frame instructs the source to stop sending packets for a specific period of time. The sending
station waits the requested amount of time before sending more data.
Figure 25-2 illustrates pause
frames being sent and received by CE-1000-4 cards and attached switches.
Figure 25-2 Flow Control
This flow-control mechanism matches the sending and receiving device throughput to that of the
bandwidth of the STS circuit. For example, a router might transmit to the Gigabit Ethernet port on the
CE-1000-4 card. This particular data rate might occasionally exceed 51.84 Mbps, but the SONET circuit
assigned to the CE-1000-4 port might be only STS-1 (51.84 Mbps). In this example, the CE-1000-4 card
sends out a pause frame and requests that the router delay its transmission for a certain period of time.
With flow control and a substantial per-port buffering capability, a private line service provisioned at less
than full line rate capacity (STS-1) is efficient because frame loss can be controlled to a large extent.
Asymmetric enables the CE-1000-4 to receive flow control pauses, but not generate flow control pauses.
This mode supports a link partner that cannot receive flow control pauses but
can send flow control
pauses. The CE-1000-4 does not have a mode where it would send flow control pauses but not be able
to receive flow control pauses.
115779
STS-N
SONET
Pause Frames
Ethernet
ONS Node ONS Node
Pause Frames
Ethernet
- Configuration Guide 1
- CONTENTS 3
- 5 Configuring POS 5-1 4
- 6 Configuring Bridges 6-1 5
- 8 Configuring VLANs 8-1 6
- 12 Configuring IRB 12-1 8
- Contents 10
- January 2009 10
- 21 Configuring RMON 21-1 13
- 22 Configuring SNMP 22-1 14
- A Command Reference A-1 18
- About this Guide 27
- Document Objectives 28
- Audience 28
- Document Organization 28
- Related Documentation 30
- Document Conventions 31
- Waarschuwing 32
- Varoitus 32
- Attention 32
- Avvertenza 33
- Advarsel 33
- ¡Advertencia! 33
- Varning! 33
- ML-Series Card Overview 39
- ML-Series Feature List 40
- ML-Series Feature List 41
- CTC Operations 45
- Baseline 46
- Auto-Refresh 46
- Chapter 2 CTC Operations 47
- Managing SONET/SDH Alarms 48
- J1 Path Trace 49
- J1 Path Trace 50
- Initial Configuration 51
- Figure 3-1 CTC IOS Window 53
- Node IP address 54
- RJ-45 Cable 56
- RJ-11 to RJ-45 56
- Console Port Adapter Cable 56
- ML1000-2 CONSOLE Port 56
- Startup Configuration File 57
- Passwords 58
- Configuring the Hostname 59
- Multiple Microcode Images 61
- Cisco IOS Command Modes 63
- Using the Command Modes 65
- Getting Help 66
- Configuring Interfaces 67
- MAC Addresses 68
- Interface Port ID 68
- Basic Interface Configuration 69
- Configuration 70
- Chapter 5, “Configuring POS.” 76
- CRC Threshold Configuration 77
- Interfaces 78
- Configuring POS 81
- Chapter 5 Configuring POS 82
- SW-LCAS 83
- Setting the MTU Size 85
- SONET/SDH Alarms 86
- Configuring SONET/SDH Alarms 87
- C2 Byte and Scrambling 88
- Monitoring and Verifying POS 89
- POS Configuration Examples 91
- ML_Series_A 92
- Configuring Bridges 97
- Configuring Basic Bridging 98
- SONET/SDH 99
- IP Routing Mode 101
- No IP Routing Mode 102
- Bridge CRB Mode 103
- Bridge IRB Mode 104
- Chapter 6 Configuring Bridges 106
- Bridge IRB Mode 106
- Configuring STP and RSTP 107
- STP Overview 108
- Supported STP Instances 108
- Bridge Protocol Data Units 108
- Election of the Root Switch 109
- Spanning-Tree Timers 110
- Blocking State 112
- Listening State 113
- Learning State 113
- Forwarding State 113
- Disabled State 113
- STP and IEEE 802.1Q Trunks 114
- Supported RSTP Instances 115
- Rapid Convergence 116
- Rapid Convergence 117
- Synchronization of Port Roles 118
- Table 7-4 RSTP BPDU Flags 119
- Topology Changes 120
- Disabling STP and RSTP 122
- Configuring the Root Switch 123
- Configuring the Port Priority 123
- Configuring the Path Cost 124
- Configuring the Hello Time 125
- Configuring VLANs 129
- ONS 15454 130
- Chapter 8 Configuring VLANs 134
- Protocol Tunneling 135
- IEEE 802.1Q Example 139
- Figure 9-3 ERMS Example 141
- Configuring Link Aggregation 149
- Configuring EtherChannel 150
- Configuring POS Channel 152
- ML_Series A 154
- ML_Series B 154
- Enabling IP Routing 161
- Configuring IP Routing 162
- Configuring RIP 163
- RIP Authentication 165
- Configuring OSPF 167
- Configuring OSPF 168
- OSPF Interface Parameters 171
- OSPF Area Parameters 172
- Change LSA Group Pacing 176
- Loopback Interface 177
- Monitoring OSPF 177
- Configuring EIGRP 178
- Configuring EIGRP 179
- EIGRP Router Mode Commands 180
- EIGRP Interface Mode Commands 181
- Configuring BGP 185
- Table 11-6 BGP Show Commands 186
- Configuring IS-IS 187
- Configuring Static Routes 189
- Monitoring Static Routes 190
- Configuring IRB 195
- IRB Configuration Example 197
- Monitoring and Verifying IRB 198
- Configuring VRF Lite 201
- vrf-name 207
- Understanding QoS 209
- Ethernet CoS 211
- ML-Series QoS 212
- Policing 213
- Scheduling 214
- Scheduling 215
- Egress Priority Marking 216
- Ingress Priority Marking 216
- Flow Control Pause and QoS 217
- QoS on Cisco Proprietary RPR 218
- Configuring QoS 220
- Creating a Traffic Policy 221
- Configuring CoS-Based QoS 225
- QoS Configuration Examples 226
- ML-Series VoIP Example 229
- ML-Series Policing Example 229
- Router_a 230
- Default Multicast QoS 232
- QoS not Configured on Egress 235
- Understanding IP SLA 239
- IP SLA on the ML-Series 240
- Understanding the SDM 243
- Understanding SDM Regions 243
- Configuring SDM 244
- Monitoring and Verifying SDM 245
- Monitoring and Verifying SDM 246
- Understanding ACLs 247
- ML-Series ACL Support 247
- Named IP ACLs 248
- User Guidelines 248
- Creating IP ACLs 249
- Modifying ACL TCAM Size 251
- Modifying ACL TCAM Size 252
- Role of SONET/SDH Circuits 254
- Packet Handling Operations 254
- Ring Wrapping 255
- Fiber Cut 256
- ML-Series RPR 256
- Ring Wrap 256
- MAC Address and VLAN Support 258
- Cisco Proprietary RPR QoS 259
- ML-Series Card 264
- Access Ports 270
- LFP Sequence 281
- Configuring LFP 282
- Monitoring and Verifying LFP 283
- (mpls) working 284
- Balancing 288
- Understanding EoMPLS 293
- Understanding EoMPLS 294
- EoMPLS Support 295
- EoMPLS Restrictions 295
- EoMPLS Quality of Service 295
- Configuring EoMPLS 296
- EoMPLS Configuration Example 301
- VC Type 5 302
- Understanding MPLS-TE 305
- Configuring MPLS-TE 306
- Configuring an MPLS-TE Tunnel 307
- MPLS-TE Configuration Example 308
- RPRW Alarm 311
- RPRW Alarm 312
- Understanding Security 313
- Understanding SSH 314
- Configuring SSH 315
- Configuring the SSH Server 316
- RADIUS on the ML-Series Card 318
- RADIUS Relay Mode 318
- RADIUS Stand Alone Mode 319
- Understanding RADIUS 320
- Configuring RADIUS 320
- Default RADIUS Configuration 321
- Release 12.2 at: 323
- Defining AAA Server Groups 325
- Starting RADIUS Accounting 328
- POS on ONS Ethernet Cards 333
- POS Interoperability 334
- Encapsulation Type and CRC 335
- POS Encapsulation Types 336
- Figure 20-2 RPR Data Frames 337
- Cisco HDLC 338
- POS Framing Modes 339
- Configuring RMON 345
- Chapter 21 Configuring RMON 347
- Clearing of CRC-ALARM 351
- Unwrap Synchronization 352
- Unwrap Synchronization 353
- Bidirectional Errors 354
- User issues 356
- Displaying RMON Status 364
- Displaying RMON Status 366
- Configuring SNMP 367
- SNMP on the ML-Series Card 368
- SNMP Versions 369
- SNMP Manager Functions 369
- SNMP Agent Functions 370
- SNMP Community Strings 370
- Supported MIBs 371
- SNMP Notifications 371
- Disabling the SNMP Agent 373
- Configuring Community Strings 373
- Chapter 22 Configuring SNMP 374
- SNMP Examples 379
- Displaying SNMP Status 380
- G-Series Application 381
- G1K-4 and G1000-4 Comparison 382
- G-Series Example 383
- /SDH Circuits 384
- ONS Node 384
- Point-to-Point Circuit 387
- ONS Node ONS Node 387
- Gigabit Ethernet Ports 391
- E-Series Application 393
- E-Series Modes 394
- Port-Mapped (Linear Mapper) 395
- E-Series VLAN Support 397
- Data Flow 399
- Redundant path (blocked) 401
- Primary path (forwarding) 401
- E-Series Circuit Protection 404
- CE-100T-8 Ethernet Operation 409
- CE-100T-8 Ethernet Features 410
- Figure 24-2 Flow Control 411
- RMON and SNMP Support 414
- Statistics and Counters 414
- CE-100T-8 Pools 419
- CE-100T-8 Pools 420
- Both Port 6 and Port 7 421
- CE-1000-4 Ethernet Operation 425
- CE-1000-4 Ethernet Features 426
- Flow Control 427
- Understanding RPR-IEEE 433
- Advantages of RPR-IEEE 434
- RPR-IEEE Framing Process 435
- RPR-IEEE Framing Process 436
- CTM and RPR-IEEE 438
- Configuring Jumbo Frames 442
- Configuring Protection Timers 444
- Configuring a Span Shutdown 446
- Configuring Keepalive Events 446
- Configuring QoS on RPR-IEEE 449
- Configuring Fairness Weights 451
- Provisioning Card Mode 463
- RI Configuration Example 471
- RI Configuration Example 474
- Command Reference 475
- Appendix A Command Reference 476
- [no] clock auto 477
- interface spr 1 478
- microcode fail system-reload 480
- [no] pos pdi holdoff time 481
- [no] pos report alarm 482
- [no] pos scramble-spe 484
- [no] rpr-ieee ri foreign 487
- [no] rpr-ieee report alarm 498
- Related Commands show int pos 519
- show ons alarm 521
- Related Commands None 551
- [no] shutdown 552
- and the 557
- At the PE1 interface: 558
- At the PE2 interface: 558
- Unsupported CLI Commands 559
- Commands 562
- Configuration Commands 563
- Using Technical Support 567
- Numerics 571
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