2547 egress pe fast failure protection draft minto 2547 egress node fast protection 00 n.
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2547 egress PE Fast Failure Protection draft-minto-2547-egress-node-fast-protection-00. Jeyananth Minto Jeganathan(minto@juniper.net) Maciek Konstantynowicz(maciek@juniper.net) Hannes Gredler(hannes@juniper.net). Problem statement.

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2547 egress pe fast failure protection draft minto 2547 egress node fast protection 00

2547 egress PE Fast Failure Protectiondraft-minto-2547-egress-node-fast-protection-00

Jeyananth Minto Jeganathan(minto@juniper.net)

Maciek Konstantynowicz(maciek@juniper.net)

Hannes Gredler(hannes@juniper.net)

problem statement
Problem statement.
  • MPLS provides fast service restoration for link and node failure except egress node failure.
  • This draft propose rfc 2547 service restoration when egress node goes down.
  • This proposal could be extended other mpls based service.
problem statement1
Problem statement.
  • In the above topology Even though service offered by other PE it cant be restored transport LSP goes down with failed egress PE.
  • Assume P router redirect traffic to other service router. Service router cant do anything as the label does signify anything.

CE4

Multi homed PE3 and PE4

CE1

PE3

PE1

P2

VPN-A site1

TL| VL1|192.168.1.1

VPN-A site2 192.168.1/24

P1

PE4

CE5

PE2

CE2

TL| VL2|192.168.1.1

CE6

VPN-B site1

Multi homed With PE4 & PE5

VPN-B site2 192.168.1./24

PE5

CE7

proposed solution
Proposed solution.
  • A new role protector, can be played by any node participates in service routing. With protector, P router sends traffic to protector when PE goes down (P router unaware service labels) and protector re-route traffic to VPN sites or other service PE.

CE4

CE1

PE3

PE1

P2

VPN-A site1

TL1| 39|192.168.1.1

VPN-A site2

P1

PE4

CE5

PE2

CE2

CE6

TL1| 41|192.168.1.1

VPN-B site1

VPN-B site2

PE5

Protector

CE7

solution details traffic reroute
Solution Details- Traffic reroute.
  • The service transport LSP will be terminated in context-identifier instead of egress PE loopback address.
  • The context-identifier is an IP address identify the service point. The context-identifier is shared between protector and the primary(which required protection). This sharing helps P router to reroute traffic to protector when egress node down.
solution details service mirroring
Solution Details- Service mirroring.
  • Context-identifier advertise by protector in IGP and a real label advertised for the bypass-LSP (LFA/MPLS FRR ) in Label protocols (So real label identify forwarding context.). Context label identify the forwarding context (context-table) in protector.
  • This context table is populated by label in service routes advertised by egress PE that required protections. The context table identify backup FIB table and lookup in that table give us the backup egress PE nexthop /or nexthop.
  • The backup FIB is populated by backup PE routes for protected egress PE.
what next
What next.
  • This can be extended to other mpls services.
  • Questions and comments?