Zwiększenie dostępności sieci poprzez kontrolowane zamykanie sesji BGP.pdf

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Improving network availability
through the
graceful shutdown of BGP sessions
PLNOG, Krakow, September 2008
Bruno Decraene
France Telecom
(bruno.decraene@orange-ftgroup.com)
Pierre Franßois
UCL
(pierre.francois@uclouvain.be)
=caj`]
Why?
(Problem statement)
What?
(Requirements)
How?
(A solution)
How good? (Test bed evaluation)
Conclusion
2
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Sduõeilnkrejcõjapskngõ]r]eh]^ehepu;
  For new applications , customers are requesting Service
Providers tighter SLA requirements, especially regarding
network availability .
e.g., VoIP, online gaming, corporate mission critical applications
  E.g. typical VoIP requirement is a traffic restoration time below
100 or 200 ms after the failure.
3
Dksõpkõeilnkraõjapskngõ]r]eh]^ehepu;
  Failures avoidance at the IP layer
Link: protection below the IP/MPLS layer
Node: state of the art hardware & software router, extensive testing.
  Local concealment
Graceful Restart, Non Stop Routing, In Service Software Upgrade (ISSU).
  Local reaction
MPLS Fast ReRoute , IP Fast reroute
  Global reaction
Usual routing convergence: IGP, BGP, IGP+ BGP
  Mixed of global & local reaction
IGP routing convergence + BGP local reaction
– BGP protection could be pre-computed & pre-installed in the FIB (e.g.
BGP PIC edge)
  Global anticipation
4
Make before break
Dksõpkõeilnkraõjapskngõ]r]eh]^ehepu;
  Most solutions are complementary with different:
Applicability: forwarding preservation, type of failure, existence of an alternate path
Cost:
states, hardware, implementation, operation
Result:
(expected) traffic loss
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