R3303-HP HSR6800 Routers Layer 3 - IP Routing Command Reference

442
Usage guidelines
The device supports 4-byte AS numbers and uses 4-byte AS numbers by default. If the peer devices
support only 2-byte AS numbers, you must enable the 4-byte AS number suppression function on the
device.
If the peer device supports 4-byte AS numbers, do not enable the suppression function. Otherwise, the
BGP peer relationship cannot be established.
Examples
# In IPv6 BGP-VPN instance view, enable 4-byte AS number suppression for peer 2001::1.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv6-family vpn-instance 11
[Sysname-bgp-ipv6-11] peer 2001::1 as-number 200
[Sysname-bgp-ipv6-11] peer 2001::1 capability-advertise suppress-4-byte-as
peer connect-interface (IPv6 address family view)
Use peer connect-interface to specify the source interface for establishing TCP connections to an IPv6
BGP peer or peer group.
Use undo peer connect-interface to restore the default.
Syntax
peer { ipv6-group-name | ipv6-address } connect-interface interface-type interface-number
undo peer { ipv6-group-name | ipv6-address } connect-interface
Default
BGP uses the outbound interface of the best route to the IPv6 BGP peer/peer group as the source
interface for establishing a TCP connection.
Views
IPv6 address family view
Default command level
2: System level
Parameters
ipv6-group-name: Name of a peer group, a string of 1 to 47 characters.
ipv6-address: IPv6 address of a peer.
interface-type interface-number: Specifies an interface by its type and number.
Usage guidelines
To enhance stability of IPv6 BGP connections, HP recommends that you use a loopback interface as the
source interface for establishing a TCP connection.
To establish multiple BGP connections to a BGP router, specify on the local router the respective source
interfaces for establishing TCP connections to the peers on the peering BGP router. If you do not, the local
BGP router might fail to establish TCP connections to the peers when using the outbound interfaces of the
best routes as the source interfaces.