[c-nsp] BGP and decrease CPU usage

[Robert Hass]

Hi

I was wondering is disabling 'bgp nexthop trigger' will decrease a
little CPU usage on router ? Eg.:

cisco(config)#router bgp 111
cisco(config-router)#address-family ipv4
cisco(config-router)#no bgp nexthop trigger enable

Router currently holds 3 full BGP feeds from external peers and nearly
ony full from iBGP.

Question for Cisco engineers with deep inside IOS knowledge: What is
most low CPU consuming way to filter all prefixes from neighbor ?
a) as-path filter deny .*
b) route-map XX deny 10
c) some sort of deny ACL (ext: deny ip any any / or standard: deny
any) or prefix-list ?
d) different way ?

I'm gonna to do some tweaks inside BGP configuration for save some
router CPU power.

Robert