"The obvious drawback to using inbound soft reconfiguration is that memory is
required to store the updates. If the neighbor is advertising a large number of
routes, or if updates from many neighbors are being stored, the impact on the
local router's memory can be significant." - Jeff Doyle Vol 2
......
I hope you can help me understand this. Does the above statement mean that :
1. Current inbound policies are still applied to incoming updates and a
copy of the update (even if rejected by current policy) is maintained in the
BGP table but not used for routing decisions.
2. After the clear ip bgp neighbor <ip> soft in is executed, the new
inbound policy is applied to the currently stored updates.
3. Future updates use the new inbound policy but a copy is still maintained
because the neighbor <> bgp soft-reconfiguration inbound is applied to the bgp
process.
Also, I read that IOS 12.1 and greater does not need the "neighbor <> bgp
soft-reconfiguration inbound" and support dynamic inbound reconfiguration. So
IOS 12.1 and greater will cause the router to store a copy of the updates no
matter what.
Comments?
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