Enabling 4-Byte As Number Suppression; Enabling Md5 Authentication For Bgp Peers - HP 5500 EI series Configuration Manual

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Enabling 4-byte AS number suppression

BGP supports 4-byte AS numbers. The 4-byte AS number occupies four bytes, in the range of 1 to
4294967295. By default, a device sends an Open message to the peer device for session establishment.
The Open message indicates that the device supports 4-byte AS numbers. If the peer device supports
2-byte AS numbers instead of 4-byte AS numbers, the session cannot be established. To resolve this issue,
enable the 4-byte AS number suppression function. The device then sends an Open message to inform
the peer that it does not support 4-byte AS numbers, so the BGP session can be established.
If the peer device supports 4-byte AS numbers, do not enable the 4-byte AS number suppression function.
Otherwise, the BGP session cannot be established.
To enable 4-byte AS number suppression (IPv4):
Step
1.
Enter system view.
2.
Enter BGP view or BGP-VPN
instance view.
3.
Enable 4-byte AS number
suppression.
To enable 4-byte AS number suppression (IPv6):
Step
1.
Enter system view.
2.
Enter BGP view or BGP-VPN
instance view.
3.
Enable 4-byte AS number
suppression.

Enabling MD5 authentication for BGP peers

MD5 authentication provides the following benefits:
Peer authentication makes sure that only BGP peers that have the same password can establish TCP
connections.
Integrity check makes sure that BGP packets exchanged between peers are intact.
To enable MD5 authentication for BGP peers (IPv4):
Command
system-view
Enter BGP view:
bgp as-number
Enter BGP-VPN instance view:
a.
bgp as-number
b.
ip vpn-instance
vpn-instance-name
peer { group-name | ip-address }
capability-advertise
suppress-4-byte-as
Command
system-view
Enter BGP view:
bgp as-number
Enter BGP-VPN instance view:
a.
bgp as-number
b.
ip vpn-instance
vpn-instance-name
peer { group-name |
ipv6-address } capability-advertise
suppress-4-byte-as
227
Remarks
N/A
N/A
By default, 4-byte AS number
suppression is not enabled.
Remarks
N/A
N/A
By default, 4-byte AS number
suppression is not enabled.

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