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111 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID.

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Presentation on theme: "111 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID."— Presentation transcript:

1 111 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID

2 2 © 2003, Cisco Systems, Inc. All rights reserved. Session Number Presentation_ID Bidirectional PIM Thom Bryant June 2003

3 333 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID Bidirectional PIM Bidirectional shared trees appeared in Core Based Trees (CBTs) proposal first Added to Simple later Idea: use the same tree for traffic from sources towards RP and from RP to receivers Benefits: Less state in routers (many sources for the same group produce one (*,G) only) Traffic from sources / to receivers follows the same path if on the same branch of the RP

4 444 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID Bidirectional PIM–Sources Source RP Traffic forwarded natively toward RP rather than registered RP identified for bidir groups (static or auto-RP)

5 555 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID 1 2 Source RP DF Designated Forwarder elected per subnet based on metric to RP Bidirectional PIM–Designated Forwarder

6 666 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID Bidirectional PIM–Receivers Source RP DF Receiver (*, G) Join Forwarding state Receivers join toward RP Forwarding state created with RPF toward RP as the iif

7 777 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID Source RP DF Receiver Traffic flows natively toward RP and can be forwarded directly on a branch toward interested receivers without first reaching RP. Traffic forwarded by Designated Forwarder toward RP Traffic for all sources in group G, forwarded based on same *,G entry Source Bidirectional PIM–Traffic Flow

8 888 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID PIM Bidir Modifications On each link, the router with the best path to the RP is elected to be the Designated Forwarder The Designated Forwarder is responsible for forwarding upstream towards the RP No special treatment is required for local sources

9 999 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID Questions? Thank you

10 10 © 2003, Cisco Systems, Inc. All rights reserved. Presentation_ID


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