Avaya Configuring IP Services Bedienungsanleitung Seite 319
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Configuring and Customizing BGP
117356-D Rev 00
8-45
Specifying a Holddown Time
The holddown time is the amount of time either peer will wait for a keepalive or
update message before declaring the connection down.
A BGP speaker that initiates a connection inserts a holddown time value into the
open message. The responding peer responds with an open message that also
contains a holddown time value. If the BGP speakers establish a session, they use
the lesser value (which must be greater than 2). There are two exceptions to this
rule:
• If one peer sends a zero holddown time, the peers use the nonzero holddown
time on the session.
• If both peers send zero holddown times, the peers observe no holddown time
on the session.
By default, BGP inserts a value of 90 seconds into the open message.
You can use the BCC or Site Manager to specify a holddown time value or disable
the holddown function.
Using the BCC
Navigate to a BGP peer-specific prompt and enter:
holddown
<seconds>
seconds
is an integer indicating the number of seconds that BGP waits for a
keepalive message before declaring the connection down.
For example, the following command sets the holddown timer to 60 seconds for
the peer session established between interfaces 2.2.2.2 and 2.2.2.5:
peer/2.2.2.2/2.2.2.5/5#
holddown 60
peer/2.2.2.2/2.2.2.5/5#
- Configuring IP Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-D Rev 00 10
- Before You Begin 23
- Text Conventions 24
- Acronyms 25
- How to Get Help 27
- Chapter 1 29
- IP Addresses 30
- Subnet Addressing 32
- Supernet Addressing 35
- Autonomous Systems 36
- Border Gateway Protocol (BGP) 38
- Router Discovery Protocol 39
- Route Preferences 40
- Route Weights 41
- Figure 1-3. IP Routing Table 43
- IP Traffic Filters 46
- RFC Compliance 46
- Chapter 2 49
- Starting IP 50
- Starting RIP 51
- Starting OSPF 52
- Starting BGP 53
- Starting Router Discovery 54
- Chapter 3 55
- Deleting IP from an Interface 57
- Customizing IP 57
- Adding RIP to an IP Interface 59
- Customizing RIP 60
- Customizing OSPF 62
- Deleting BGP from the Router 64
- Customizing BGP 65
- Starting EGP 66
- Deleting EGP from the Router 67
- Customizing EGP 67
- Starting NAT 68
- Chapter 4 77
- The IP global prompt appears 79
- (default) 99
- Caution: 100
- Customizing an IP Interface 102
- <ip_address> 105
- <address_mask> 105
- Using the BCC 108
- Using Site Manager 108
- IP0012A 121
- Configuring an SMDS Address 123
- is one of the following: 128
- Defining a Static Route 132
- (continued) 135
- (continued) 135
- Choosing a Broadcast Type 140
- Chapter 5 143
- ARP Overview 144
- <state> 146
- Figure 5-2. Proxy ARP Example 151
- Chapter 6 155
- Customizing RIP Services 155
- Setting the RIP Diameter 156
- Customizing a RIP Interface 158
- Selecting the RIP Version 162
- Specifying the Update Mode 165
- Sending Triggered Updates 166
- Listening for a Default Route 175
- Chapter 7 201
- Customizing OSPF Services 201
- OSPF Concepts and Terminology 202
- OSPF Neighbors 203
- Neighbor Adjacencies 204
- Designated Routers 204
- OSPF Areas 205
- OSPF Router Types 206
- AS External Routes 206
- OSPF Implementation Notes 207
- OSPF interfaces 208
- For example: 209
- Supplying an OSPF ID 211
- Figure 7-2. OSPF ASE Routes 216
- (default) 220
- Setting the Holddown Timer 221
- Configuring Message Logging 222
- Enabling and Disabling OSPF 228
- Configuring an Area ID 229
- Specifying the Interface Type 230
- Estimating the Transit Delay 235
- Setting the Hello Interval 237
- Setting the Dead Interval 239
- Specifying the Metric Cost 242
- Specifying the MTU Size 244
- Defining an Area 247
- Modifying an Area ID 249
- Configuring Authentication 249
- Configuring a Summary Route 251
- Configuring a Stub Area 252
- Chapter 8 275
- BGP Concepts and Terminology 276
- Peer-to-Peer Sessions 277
- Interior BGP Routing 278
- IBGP Route Reflector 279
- BGP Updates 280
- Best-Route Selection 283
- BGP/OSPF Interaction 283
- BGP Implementation Notes 284
- Configuring BGP Globally 285
- Enabling and Disabling BGP 286
- Supplying a BGP Identifier 288
- Identifying the Local AS 289
- Enabling Multihop Connections 295
- Configuring BGP as a Soloist 298
- Negotiating the BGP Version 313
- Keeping the Connection Alive 315
- Specifying a Holddown Time 319
- Setting the Route Echo Switch 326
- med-method override 342
- Using Site Manage 346
- <name> 387
- Chapter 9 391
- Customizing EGP Services 391
- EGP Concepts and Terminology 392
- EGP Implementation Notes 395
- Customizing EGP on the Router 396
- Supplying a Local AS Number 397
- Configuring a Neighbor 398
- Specifying the Gateway Mode 400
- Choosing the Acquisition Mode 402
- Choosing the Poll Mode 403
- Setting Neighbor Timers 404
- Chapter 10 405
- Security Label Format 406
- Inbound IP Datagrams 408
- Forwarded IP Datagrams 408
- Originated IP Datagrams 409
- Unlabeled IP Datagrams 409
- Enabling and Disabling RIPSO 410
- Outbound Datagrams 418
- Error Datagrams 419
- RIPSO Example 420
- Figure 10-2. RIPSO Example 421
- Chapter 11 423
- BFE Addressing 425
- Chapter 12 433
- Dynamic Address Translation 434
- Static Address Translation 439
- Enabling and Disabling NAT 441
- Configuring the Log Mask 443
- Table 12-2. Log Message Types 444
- Customizing a NAT Interface 447
- Modifying the Interface Type 448
- Adding a Local Address Range 451
- Adding a Global Address Range 454
- IP0076A 459
- Chapter 13 461
- How GRE Tunneling Works 462
- Figure 13-1. GRE Tunneling 463
- Announce Policy 464
- Accept Policy 465
- Static Routes 465
- Configuring IPX Services 467
- Deleting a GRE Tunnel 471
- Appendix A 473
- Site Manager Parameters 473
- BGP Parameters 474
- BGP Configuration Parameters 475
- BGP Global Parameters 475
- BGP-3 Global Parameter 482
- BGP-4 Global Parameter 482
- BGP Peer Parameters 482
- BGP Event Message Parameters 493
- EGP Global Parameters 495
- EGP Neighbor Parameters 496
- IP Parameters 499
- IP Interface Parameters 501
- IP Global Parameters 515
- Static Route Parameters 523
- Adjacent Host Parameters 526
- RIPSO Parameters 529
- Router Discovery Parameters 539
- OSPF Parameters 541
- OSPF Interface Parameters 548
- OSPF Area Parameters 557
- Area Range Parameters 559
- RIP Parameters 564
- NAT Parameters 571
- Appendix B 579
- Routing Policies 579
- Appendix C 637
- RIP Export Filters 641
- OSPF Import Filters 644
- OSPF Export Filters 645
- BGP-3 Import Filters 648
- 650
- BGP-3 Export Filters 653
- EGP Import Filters 657
- EGP Export Filters 659
- 661
- Appendix D 665
- Route Weight Worksheet 665
- Appendix E 669
- IP/OSPF Configuration 669
- 128.10.6.0 670
- 255.255.255.248 670
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