1 pa-mhome-community IPv6 multihoming using provider independent (PI) space not possible (until now?) Other approaches not ready yet (shim6) So use more.

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Presentation transcript:

1 pa-mhome-community IPv6 multihoming using provider independent (PI) space not possible (until now?) Other approaches not ready yet (shim6) So use more specific from ISP's provider aggregatable (PA) block But: IPv4: /24s generally accepted IPv6: many people only accept minimum allocation size (/32) from PA space

2 Pros and Cons of PA Pro: address space easy to get only need to talk to ISP, not RIR compatible with future shim6 mechanism survive filtering of all /48s, /56s etc. because of ISP's PA aggregate Con: still dependency on address providing ISP this means renumber upon leaving this ISP

3 BGP Community Proposal to get around filters: tag prefixes with BGP well-known community let's call it MULTIHOME So for all network operators: when filtering on /32, allow /48s (/56s?) that have MULTIHOME community draft-van-beijnum-v6ops-pa-mhome- community-01.txt

4 Example Filter Config Pseudo code: 10 IF (pfx falls-in list-of-direct-allocation-blocks AND length(pfx) less-or-equal /48) THEN ACCEPT 20 IF (pfx falls-in ipv6-global-unicast-space AND length(pfx) less-or-equal /32) THEN ACCEPT 30 IF (pfx falls-in ipv6-global-unicast-space AND pfx has-community MULTIHOME AND length(pfx) less-or-equal /56) THEN ACCEPT 40 REJECT