Cisco dual stack CE BGP configuration suggestions

[Nick Hilliard]

On 20/01/2011 17:15, Roger Wiklund wrote:
> etc. To have "Router BGP + address family ipv6" or "Router BGP +
> address-family ipv4 + address-family ipv6"

"Router BGP + address-family ipv4 + address-family ipv6"

You also want "no bgp default ipv4-unicast".  This commands means that you 
don't have to explicit disable ipv4 afi over ipv6 transport like this:

> router bgp 172
[...]
>   address-family ipv4
>    no neighbor FD85:A55C:FDCB::5 activate
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Also, as a general principle, you probably want:

router bgp 172
  bgp deterministic-med
  bgp always-compare-med

  address-family ipv4
   distance bgp 200 200 200
  address-family ipv6
   distance bgp 200 200 200

For an explanation of why you want these, see Philip Smith's excellent 
presentations on bgp:

http://www.google.com/search?q=%22philip+smith%22+bgp+%2Bfiletype%3Appt

Nick