Dell Force10 Z9000 Configuration Manual page 164

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
3. Enable the BGP neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} no shutdown
Examples of the show ip bgp Commands
NOTE: When you change the configuration of a BGP neighbor, always reset it by entering the clear ip bgp *
command in EXEC Privilege mode.
To view the BGP configuration, enter show config in CONFIGURATION ROUTER BGP mode. To view the BGP status, use the
show ip bgp summary command in EXEC Privilege mode. The first example shows the summary with a 2-byte AS number
displayed (in bold); the second example shows that the summary with a 4-byte AS number using the show ip bgp summary
command (displays a 4–byte AS number in bold).
The following example shows the show ip bgp summary command output (2–byte AS number displays).
R2#show ip bgp summary
BGP router identifier 192.168.10.2, local AS number 65123
BGP table version is 1, main routing table version 1
1 network entrie(s) using 132 bytes of memory
1 paths using 72 bytes of memory
BGP-RIB over all using 73 bytes of memory
1 BGP path attribute entrie(s) using 72 bytes of memory
1 BGP AS-PATH entrie(s) using 47 bytes of memory
5 neighbor(s) using 23520 bytes of memory
Neighbor AS
10.10.21.1 65123 0
10.10.32.3 65123 0
164
Border Gateway Protocol IPv4 (BGPv4)
before assigning it a remote AS.
MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
0 0
0 0
0 0 never Active
0 0 never Active