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20-11
Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 20 POS on ONS Ethernet Cards
Ethernet Clocking Versus SONET/SDH Clocking
Figure 20-11 ML-Series Card Framing and Encapsulation Options
Ethernet Clocking Versus SONET/SDH Clocking
Ethernet clocking is asynchronous. IEEE 802.3 clock tolerance allows some links in a network to be as
much as 200 ppm (parts or bits per million) slower than other links (0.02%). A traffic stream sourced at
line rate on one link may traverse other links which are 0.02% slower. A fast source clock, or slow
intermediate clocks, may limit the end-to-end throughput to only 99.98% of the source link rate.
Traditionally, Ethernet is a shared media that is under utilized except for brief bursts which may combine
from multiple devices to exceed line-rate at an aggregation point. Due to this utilization model, the
asynchronous clocking of Ethernet has been acceptable. Some Service Providers accustomed to loss-less
TDM transport may find the 99.98% throughput guarantee of Ethernet surprising.
Clocking enhancements on ONS Ethernet cards, excluding the E-Series cards, ensure Ethernet transmit
rates that are at worst 50 ppm slower than the fastest compliant source clock, ensuring a worst-case
clocking loss of 50 ppm - a 99.995% throughput guarantee. In many cases, the card’s clock will be faster
than the source traffic clock, and line-rate traffic transport will have zero loss. Actual results will depend
on clock variation of the traffic source transmitter.
SONET/SDH Frame
SONET/SDH Payload EnvelopeTransport Overhead
LEX PPPCisco HDLC
HDLC Framing Mode GFP-F Framing Mode
Flag Address Control Protocol Payload FCS
BCP
or
Encapsulation
GFP-F Frame Types
115448
GFP-Mapped
Ethernet (LEX)
GFP-PPP GFP-BCP
GFP-Cisco HDLC
Core
Header
Payload
Header
Payload FCS
- Configuration Guide 1
- CONTENTS 3
- Contents 10
- About this Guide 27
- Document Objectives 28
- Audience 28
- Document Organization 29
- Related Documentation 30
- Document Conventions 31
- Waarschuwing 32
- Varoitus 32
- Attention 33
- Avvertenza 33
- Advarsel 33
- ¡Advertencia! 34
- Varning! 34
- 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
- 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
- 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
- Router(config-if)# shutdown 278
- LFP Sequence 281
- Configuring LFP 282
- Monitoring and Verifying LFP 283
- Balancing 288
- Understanding EoMPLS 293
- Understanding EoMPLS 294
- EoMPLS Support 295
- EoMPLS Restrictions 295
- EoMPLS Quality of Service 295
- Configuring EoMPLS 296
- ip-address 297
- bridge-group-number 300
- 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
- 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
- ONS Node 385
- Point-to-Point Circuit 387
- ONS Node ONS Node 387
- ONS NodeONS Node 388
- SONET/SDH 388
- Ethernet 388
- Ethernet TDM 389
- 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
- is populated only by the 458
- Provisioning Card Mode 463
- RI Configuration Example 471
- RI Configuration Example 474
- Command Reference 475
- Appendix A Command Reference 476
- Router(config)# 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
- Maintenance) 490
- rpr-ieee flag c2 value 496
- [no] rpr-ieee report alarm 498
- Related Commands show int pos 519
- show ons alarm 521
- Related Commands None 551
- [no] shutdown 552
- 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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