Dell S4820T Configuration Manual page 217

of the interface directly connected to the router. First, the BGP process determines if all internal BGP
peers are reachable, then it determines which peers outside the AS are reachable.
NOTE: Sample Configurations
1. Assign an AS number and enter ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
• as-number: from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte) or 0.1 to 65535.65535
(Dotted format).
Only one AS is supported per system.
NOTE: If you enter a 4-Byte AS number, 4-Byte AS support is enabled automatically.
a. Enable 4-Byte support for the BGP process.
NOTE: This command is OPTIONAL. Enable if you want to use 4-Byte AS numbers or if you
support AS4 number representation.
CONFIG-ROUTER-BGP mode
bgp four-octet-as-support
NOTE: Use it only if you support 4-Byte AS numbers or if you support AS4 number
representation. If you are supporting 4-Byte ASNs, enable this command.
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 are displayed in ASPLAIN format.
b. Enable IPv4 multicast or IPv6 mode.
CONFIG-ROUTER-BGP mode
address-family [ipv4 | ipv6} vrf
Use this command to enter BGP for IPv6 mode (CONF-ROUTER_BGPv6_AF).
2. Add a neighbor as a remote AS.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group name} remote-as as-number
• peer-group name: 16 characters
• as-number: from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte) or 0.1 to 65535.65535
(Dotted format)
Formats: IP Address A.B.C.D
You must Configure Peer Groups
Border Gateway Protocol IPv4 (BGPv4)
for enabling BGP routers are found at the end of this chapter.
before assigning it a remote AS.
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