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https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-sy/irg-15-sy-book/irg-4byte-asn.html
Jan 19, 2018 · Reserved and Private AS Numbers. In Cisco IOS XE Release 2.3 and later releases, the Cisco implementation of BGP supports RFC 4893. RFC 4893 was developed to allow BGP to support a gradual transition from 2-byte AS numbers to 4-byte AS numbers.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-support-for-4-byte-asn.html
Sep 12, 2019 · BGP Support for 4-byte ASN The Cisco implementation of 4-byte autonomous system (AS) numbers uses asplain (65538, for example) as the default regular expression match and the output display format for AS numbers.
https://community.cisco.com/t5/routing/bgp-4-byte-asn/td-p/1110660
Does the Cisco 7600 router support a 4-Byte BGP ASN? Are there any problems with using a 4-Byte ASN? Thanks, Lee. Labels: Routing Protocols; I have this problem too. 0 Helpful ... IOS XR supports 4-byte ASN since 3.4. IOS will support 4-byte ASN; 12.2SRD for 7600 and 7200. 12.5T for 1800/2800/3800, 7200, and 7300. 12.2SB-Rel6 for 7200, 7300, 10000.
https://community.cisco.com/t5/routing/bgp-asn-32-bits-on-ios-12-4-24-t/td-p/1972171
Solved: Hello guys, I'm trying to establish a BGP neighborship with my ISP using my own ASN. The thing is that AS is a 32bit AS. I read on others papers that since the IOS 12.4(24) the support for ASN 4byte(32bits) was introduced. For some reason I
https://ipnet.xyz/2009/09/cisco-2-bytes-4-bytes-asn-bgp-scenarios/
Sep 18, 2009 · Hello Vaib, According to Cisco the 3750 cannot support yet (or maybe ever) the 4-byte ASN. So you’ll have to connect both ISP to that 1841 and apply a basic “single-homed” BGP configuration.You have to establish BGP sessions with both providers and to receive prefixes (or just a default route) from them.
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090729-bgp
Recent versions of Cisco IOS Software support RFC4893 ("BGP Support for Four-octet AS Number Space") and contain two remote denial of service (DoS) vulnerabilities when handling specific Border Gateway Protocol (BGP) updates.
https://securitytracker.com/id?1022619
The following three conditions are required for successful exploitation of this vulnerability: * Affected Cisco IOS Software device is a 4-byte AS number BGP speaker * BGP peering neighbor is a 2-byte AS number BGP speaker * BGP peering neighbor is capable of sending a BGP update with a series of greater than one thousand AS numbers Note: Note ...
https://networklessons.com/bgp/bgp-4-byte-number
BGP speakers that support 4-byte AS numbers advertise this via BGP capability negotiation and there is backward compatibility. When a “new” router talks to an “old” router (one that only supports 2-byte AS numbers), it can use a reserved AS number (23456) called AS_TRANS instead of its 4-byte AS number.
https://sites.google.com/site/amitsciscozone/home/bgp/understanding-bgp-4-byte
Interaction with Neighbors New BGP Speaker advertises to its neighbor that it uses a 4-byte ASN using BGP Capability Advertisements. If the neighbor also advertises that it uses a 4-byte ASN i.e. a New BGP Speaker, the two neighbors can inform each other of their 4-byte ASNs using OPEN messages.
https://cciejc.blogspot.com/2013/04/bgp-support-for-4-byte-asn.html
Apr 18, 2013 · BGP Support for 4-byte ASN Prior to January 2009, BGP autonomous system numbers that were allocated to companies were 2-octet numbers in the range from 1 to 65535 as described in RFC 4271, A Border Gateway Protocol 4 (BGP-4) .
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