Corporate Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706USA
? 2003, 2005–2006 Cisco Systems, Inc. All rights reserved.BGP Increased Support of Numbered AS-Path Access Lists to 500First Published: 12.0(22)S Last Updated: February 28, 2006The BGP Increased Support of Numbered AS-Path Access Lists to 500 feature is an enhancement for Border Gateway Protocol (BGP) autonomous system access lists. This enhancement increases the maximum number of autonomous system access lists that can be configured with the ip as-path access-list command from 199 to 500.History for the BGP Increased Support of Numbered AS-Path Access Lists to 500 Feature Finding Support Information for Platforms and Cisco IOS Software Images Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at https://www.doczj.com/doc/f217436750.html,/go/fn . You must have an account on https://www.doczj.com/doc/f217436750.html,.If you do not have an account or have forgotten your username or password,click Cancel at the login dialog box and follow the instructions that appear.
Contents ?Restrictions for BGP Increased Support of Numbered AS-Path Access Lists to 500, page 2
?Information About BGP Increased Support of Numbered AS-Path Access Lists to 500, page 2
?Additional References, page 4
Release Modification 12.0(22)S This feature was introduced.12.2(15)T This feature was integrated into Cisco IOS Release 12.2(15)T.12.2(18)S This feature was integrated into Cisco IOS Release 12.2(18)S.12.2(27)SBC This feature was integrated into Cisco IOS Release 12.2(27)SBC.12.2(28)SB This feature was integrated into Cisco IOS Release 12.2(28)SB.
BGP Increased Support of Numbered AS-Path Access Lists to 500 Restrictions for BGP Increased Support of Numbered AS-Path Access Lists to 500
2Cisco IOS Release: Multiple releases (see the Feature History table)
Restrictions for BGP Increased Support of Numbered
AS-Path Access Lists to 500
The number range for the lat access-list command has been increased from 1 to 199 to 1 to 500.
However, the maximum number of access lists that can be configured is still only 199. Information About BGP Increased Support of Numbered
AS-Path Access Lists to 500
To configure this feature, you must understand the following concepts:
?BGP Autonomous System Path Access Lists, page2
?Affected Components, page2
?More Information About the Affected Components, page3
BGP Autonomous System Path Access Lists
BGP autonomous system path access lists are used to filter both inbound and outbound BGP routes.
These lists also support regular expressions.
Affected Components
The upgrade introduced by this feature is part of a global enhancement that also affects other
components in addition to the ip as-path access-list command.The following components are affected.
Each command is cross-referenced to the corresponding command reference page.
?The number range of extended community-lists that can be configured for a route-reflector group with the bgp rr-group command has been increased from 100 to 199 to 100 to 500.
?The number range of access-lists that can be configured for a local-area transport(LAT)node with the lat access-list command has been increased from1to199to1to500.However,the maximum
number of access lists that can be configured is still 199.
?The expanded community list number range for the ip community-list command has been increased from 199 to 500.
?The number range of expanded community lists that can be configured with the ip
extcommunity-list command has been increased from 100 to 199 to 100 to 500
?The maximum number of community list numbers that can be configured with the match
community command was changed from 199 to 500.
?The maximum number of extended community list numbers that can be configured with the match extcommunity command was changed from 199 to 500.
?The range of expanded community list numbers that can be configured with the set comm-list delete command has been increased from 100 to 199 to 100 to 500.
?The maximum number of numbered access lists that can be configured for the x29 access-list
command has been increased from 199 to 500.
BGP Increased Support of Numbered AS-Path Access Lists to 500
Information About BGP Increased Support of Numbered AS-Path Access Lists to 500
More Information About the Affected Components
Refer to the following sections for more information about the commands that have been changed by this
enhancement:
BGP Support
The BGP Increased Support of Numbered AS-Path Access Lists to 500 feature is an extension of the
BGP routing protocol. For more information about configuring BGP with the ip as-path access-list
command, refer to the “Configuring BGP” chapter of the Cisco IOS IP Configuration Guide and the
“BGP Commands”chapter in the Cisco IOS IP Command Reference,Volume2of4:Routing Protocols,
Release 12.3.
Access-List Support
For more information about configuring IP access lists, refer to the “Configuring IP Services” chapter
of the Cisco IOS IP Configuration guide and the Cisco IOS IP Command Reference, Volume 1 of 4:
Addressing and Services, Release 12.3.
bgp rr-group Command Support
For more information about configuring route reflectors and route-reflector groups with the
bgp rr-group command, refer to the “Configuring BGP” chapter of the Cisco IOS IP Configuration
Guide and the “BGP Commands” chapter in the Cisco IOS IP Command Reference, Volume 2 of 4:
Routing Protocols, Release 12.3.
ip as-path access-list Command Support
For more information about configuring autonomous-system access-list paths with the ip as-path
access-list command,refer to the“Configuring BGP”chapter of the Cisco IOS IP Configuration Guide
and the “BGP Commands” chapter in the Cisco IOS IP Command Reference, Volume 2 of 4: Routing
Protocols, Release 12.3.
ip community-list Command Support
For more information about configuring community lists with the ip community-list command,refer to
the “Configuring BGP” chapter of the Cisco IOS IP Configuration Guide and the “BGP Commands”
chapter in the Cisco IOS IP Command Reference, Volume 2 of 4: Routing Protocols, Release 12.3.
ip extcommunity-list Command Support
For more information about configuring extended community lists with the ip extcommunity-list
command, refer to the “Configuring BGP” chapter of the Cisco IOS IP Configuration Guide and the
“BGP Commands”chapter in the Cisco IOS IP Command Reference,Volume2of4:Routing Protocols,
Release 12.3.
lat access-list Command Support
For more information about configuring the local-area transport(LAT)with the lat access-list command,
refer to the Cisco IOS Wide-Area Networking Configuration Guide and Cisco IOS Wide-Area Networking
Command Reference, Release 12.3.
match community-list Command Support
For more information about configuring extended community lists and route-maps with the match
community-list command, refer to the “Configuring BGP” chapter of the Cisco IOS IP Configuration
Guide and the “BGP Commands” chapter in the Cisco IOS IP Command Reference, Volume 2 of 4:
Routing Protocols, Release 12.3.
Cisco IOS Release: Multiple releases (see the Feature History table)
3
BGP Increased Support of Numbered AS-Path Access Lists to 500 Additional References
4Cisco IOS Release: Multiple releases (see the Feature History table)
match extcommunity-list Command Support
For more information about configuring extended community lists and route-maps with the match
extcommunity-list command,refer to the“Configuring BGP”chapter of the Cisco IOS IP Configuration Guide and the “BGP Commands” chapter in the Cisco IOS IP Command Reference, Volume 2 of 4:
Routing Protocols, Release 12.3.
set comm-list delete Command Support
For more information about configuring extended community lists and route-maps with the set
comm-list delete command,refer to the“Configuring BGP”chapter of the Cisco IOS IP Configuration Guide and the “BGP Commands” chapter in the Cisco IOS IP Command Reference, Volume 2 of 4:
Routing Protocols, Release 12.3.
x29 access-list Command Support
For more information about configuring X29with the x29access-list command,refer to the Cisco IOS Dial Technologies Configuration Guide and Cisco IOS Dial Technologies Command Reference,
Release12.3.
Additional References
The following sections provide references related to the BGP Increased Support of Numbered AS-Path
Access Lists to 500 feature.
Related Documents
Related Topic Document Title
BGP commands Cisco IOS Release 12.0 Network Protocols Command Reference,
Part 1
Cisco IOS IP Command Reference, Volume 2 of 3: Routing
Protocols, Release 12.2
Cisco IOS IP Command Reference, Volume 2 of 4: Routing
Protocols, Release 12.3
BGP configuration tasks Cisco IOS Release 12.0 Network Protocols Configuration Guide,
Part 1
Cisco IOS IP Configuration Guide,Release 12.2
Cisco IOS IP Configuration Guide,Release 12.3
BGP Increased Support of Numbered AS-Path Access Lists to 500
Additional References 5
Cisco IOS Release: Multiple releases (see the Feature History table)Standards
MIBs
RFCs
Technical Assistance
Standard
Title None —
MIB
MIBs Link None To locate and download MIBs for selected platforms, Cisco IOS
releases, and feature sets, use Cisco MIB Locator found at the
following URL:
https://www.doczj.com/doc/f217436750.html,/go/mibs
RFC
Title None —
Description
Link The Cisco Technical Support & Documentation
website contains thousands of pages of searchable
technical content, including links to products,
technologies, solutions, technical tips, and tools.
Registered https://www.doczj.com/doc/f217436750.html, users can log in from this page
to access even more content.https://www.doczj.com/doc/f217436750.html,/techsupport
BGP Increased Support of Numbered AS-Path Access Lists to 500 Additional References
6Cisco IOS Release: Multiple releases (see the Feature History table)
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only.Any use of actual IP addresses in illustrative content is unintentional and coincidental.
? 2003, 2005–2006 Cisco Systems, Inc. All rights reserved.
CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP,
CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital,
the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, LightStream, Linksys, MeetingPlace, MGX, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet,
The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the
United States and certain other countries.
All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0601R)