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draft-chown-v6ops-vlan-usage-01

draft-chown-v6ops-vlan-usage-01. Tim Chown tjc@ecs.soton.ac.uk v6ops WG, IETF 60, San Diego, August 2, 2004. Scenario. Enterprise site Has no IPv6 support in L2/L3 switch-router equipment IEEE 802.1Q VLAN tagging support available External IPv6 connectivity present (not essential)

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draft-chown-v6ops-vlan-usage-01

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  1. draft-chown-v6ops-vlan-usage-01 Tim Chown tjc@ecs.soton.ac.uk v6ops WG, IETF 60, San Diego, August 2, 2004

  2. Scenario • Enterprise site • Has no IPv6 support in L2/L3 switch-router equipment • IEEE 802.1Q VLAN tagging support available • External IPv6 connectivity present (not essential) • Delivered to IPv6-capable (maybe PC) router at site • (PC) router supports VLAN tagging on interfaces (e.g. BSD), ideally multiple tags per interface • Can write any VLAN tag to internal facing traffic

  3. Deployment • Connect IPv6 (PC) router interface(s) to existing IPv4 L2/L3 switch-router equipment • Injects IPv6 RAs into existing IPv4 subnet VLANs • IPv6 thus enabled dual-stack on the wire • Typically inject one IPv6 RA prefix per IPv4 subnet • Leads to IPv6 links congruent with IPv4 subnets • IPv4 subnet/IPv6 links remain reconfigurable via software VLAN control

  4. Advantages • Easy to deploy IPv6 if VLAN support present • Flexibility in provision thanks to VLAN tagging • Flexibility in limiting where IPv6 access is offered • Allows site to use real IPv6 addressing • Often collapse multiple VLANs to single interface • Can scale up provision with more interfaces • No IPv4 host or router configuration changes • Multicast (PIM-SM/SSM) friendly • Easy migration when IPv6 equipment available

  5. Discussion? • Is this worth documenting? • It’s kind of obvious, but very useful • It is cited in our campus-transition draft • If so, is it complete enough? • More examples might be useful (Pekka) • If so, is it ready for WG adoption?

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