Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 213
Sample Configurations, Command Syntax, Command Mode, Purpose, bgp four-octet-as-support
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In BGP, neighbor routers or peers can be classified as internal or external. External BGP peers must be connected physically to one another (unless you enable the EBGP multihop feature), while internal BGP peers do not need to be directly connected. The IP address of an EBGP neighbor is usually the IP address of the interface directly connected to the router. First, the BGP process determines if all internal BGP peers are reachable, and then it determines which peers outside the AS are reachable. Note: Sample Configurations for enabling BGP routers are found at the end of this chapter. Use these commands in the following sequence, starting in the CONFIGURATION mode to establish BGP sessions on the router. Step 1 Command Syntax router bgp as-number 1a bgp four-octet-as-support Command Mode Purpose CONFIGURATION Assign an AS number and enter the ROUTER BGP mode. AS Number: 0-65535 (2-Byte) or 1-4294967295 (4-Byte) or 0.1-65535.65535 (Dotted format) Only one AS is supported per system If you enter a 4-Byte AS Number, 4-Byte AS Support is enabled automatically. CONFIG-ROUTER-BGP Enable 4-Byte support for the BGP process. Note: This is an OPTIONAL command. Enable if you want to use 4-Byte AS numbers or if you support AS4 Number Representation. Use it only if you support 4-Byte AS Numbers or if you support AS4 Number Representation. If you are supporting 4-Byte ASNs, this command must be enabled first. Disable 4-Byte support and return to the default 2-Byte format by using the no bgp four-octet-as-support command. You cannot disable 4-Byte support if you currently have a 4-Byte ASN configured. Disabling 4-Byte AS Numbers also disables ASDOT and ASDOT+ number representation. All AS Numbers will be displayed in ASPLAIN format. 1b address-family [ipv4 | ipv6} CONFIG-ROUTER-BGP Enable IPv4 multicast or IPv6 mode. Use this command to enter BGP for IPv6 mode (CONF-ROUTER_BGPv6_AF). 2 neighbor {ip-address | CONFIG-ROUTER-BGP Add a neighbor as a remote AS. peer-group name} remote-as Formats: as-number IP Address A.B.C.D Peer-Group Name: 16 characters AS-number: 0-65535 (2-Byte) or 1-4294967295 (4-Byte) or 0.1-65535.65535 (Dotted format) Border Gateway Protocol IPv4 (BGPv4) | 213
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