BGP Add-Paths i niezależna konwergencja prefiksów.pdf

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BGP Add-Paths
Pierre Francois
Institute IMDEA Networks
Pierre.Francois@imdea.org
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To C
• Control-plane evolution : BGP Add-paths
• Data-plane evolution : BGP PIC
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BGP PIC
Sub-second data-plane convergence
• Fast switchover to pre-installed alternate paths
• BGP converges when IGP converges
• Convergence, not Fast ReRoute
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FIB design
From flat FIB...
RIB
ASBR2
Prefix
NH or oif
} BGP
} IGP
ASBR1
p/P
ASBR1
q/Q
ASBR1
r/R
ASBR2
...
...
...
...
R1
ASBR1
north oif
ASBR2
east oif
FIB
IGP change leads
to FIB Updates
for BGP prefixes !
Prefix
oif
p/P
north oif
q/Q
north oif
r/R
east oif
ASBR1
north oif
ASBR2
east oif
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FIB design
to hierarchical FIB...
FIB
ASBR2
Prefix
NH or oif
ASBR1
p/P
ASBR1
q/Q
ASBR1
r/R
ASBR2
...
...
...
...
R1
ASBR1
north oif
ASBR2
east oif
PIC “core”
Update of the outgoing interface for a BGP nexthop
impacts all prefixes tracked by the nexthop
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