joão damas. apricot 2002, march 2002, bangkok. 1 extending rpsl: ipv6, multicast, … presented by...

1João Damas . APRICOT 2002 , March 2002, Bangkok . http://www.ripe.net

Extending RPSL:IPv6, multicast, …

Presented by

João Damas

RIPE NCC

João Damas . APRICOT 2002 , March 2002, Bangkok . http://www.ripe.net 2

Outline

• Introduction• Requirements• First proposal• Second proposal• Questions


Introduction

• RPSL (RFC 2622).– Allows flexible specification of routing policies– Is defined only for IPv4 unicast routing– Allows limited future expandability

• More and more we hear requests to extend RPSL to be able to describe multicast and/or IPv6 routing policies.


Requirements

• Describe policy for multiple protocols– IPv6– Multicast

• Minimise increase in complexity, especially for users

• Take into account compatibility with existing tools


First draft

• Described in draft-parent-multiprotocol-rpsl-00.txt (which supersedes draft-parent-ipv6-rpsl-00.txt)

• Presented at RIPE 41, January, Amsterdam• Intention is to jumpstart the process of expanding

RPSL.


draft-parent-multiprotocol-rpsl-00(1)

• Introduces new address families

[afi <address-family>] <address-prefix>

where:

<address-family> = enum[ipv4, ipv6, ipv4-multicast, ipv6-multicast]

The afi <address-family> syntax may be omitted under some circumstances, if appropriate defaults are defined.



• Route classroute: 10.0.0.0/8origin: AS1

route: afi ipv4 10.0.0.0/6origin: AS1

route: afi ipv6 3ffe:ffff::/28origin: AS1

• Route-set class

route-set: ipv6-martians members: afi ipv6 ff00::/8 members: afi ipv6 fe80::/10

…



• Peering-set classpeering-set: AS1-v6

peering: AS1 afi ipv6 3ffe:ffff::1 at afi ipv6 3ffe:ffff::2

• Autnum– Extend dictionary to define– afi (IPv4, IPv6) address family– safi (unicast, multicast) subsequent address family



import: [protocol <protocol> [afi(address-family) safi(subsequent-address-family)]] [into protocol <protocol>] from <peering> [action <action>] accept <filter>

export: [protocol <protocol> [afi(address-family)] safi(subsequent-address-family)]] [into protocol <protocol>] to <peering> [action <action>] announce <filter>Example:

import: protocol BGP afi(ipv6), safi(unicast) from AS1 afi ipv6 3ffe:ffff::1 at afi ipv6 3ffe:ffff::2 accept AS1:RS-PROVIDER

import: protocol BGP afi(ipv6), safi(unicast) from AS1-v6 accept AS1:RS-PROVIDER


Comments on the draft

• More consideration needs to be given to– currently available systems, both server and client side

• scripts will “choke” If they receive something likeroute: afi ipv4 10.0.0.0/6origin: AS1

route: afi ipv6 3ffe:ffff::/28origin: AS1

– clarity for the user who needs to write and read the new RPSLimport: protocol BGP afi(ipv6), safi(unicast)

from AS1 afi ipv6 3ffe:ffff::1 at afi ipv6 3ffe:ffff::2 accept AS1:RS-PROVIDER


Second proposal (1)

• Recognise three main items in RPSL– Objects where policy is described (autnum)

• May or may not be dependant on the address family.

– Objects identifying prefixes and their relationship to ASNs (route)

• Fully dependant on the address family

– shorthand notation objects (as-set,route-set,filter-set)


Second proposal (2)

• Create new route6 classroute6: 3ffe:ffff::/28

origin: AS1• Clearly separates address family representation.• Allows for query level selection of returned results

and helps prevent current tools from facing unexpected input.

• It also reflects server side representation differences, since the prefix is a lookup key


Second proposal (3)

• autnum class– option would be to define import6 and export6 attributes inside the

object.

– Separates policy items for different address families– Is more clear for humans– existing tools are not faced with unexpected data

Pitfall: – May require duplication of policy if it is your IPv4 and IPv6

policies are the same– Is less elegant from a pure language perspective

• Other classes– would follow the same pattern as for classes above


Questions?

joão damas. apricot 2002, march 2002, bangkok. 1 extending rpsl: ipv6, multicast, … presented by...

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