802.17 MAC Compatibility With 802.1D/Q November 2001 · 2001. 11. 9. · (11/8/01) 802-17-01-00050, mh_brcom_03 Page 1 802.17 MAC Compatibility With 802.1D/Q November 2001 Marc Holness,

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 1

802.17 MAC Compatibility With 802.1D/Q

November 2001

Marc Holness, Nortel NetworksAnoop Ghanwani, Lantern Communications

Jeanne De Jaegher, AlcatelJason Fan, LuminousRobin Olsson, Vitesse

CP Fu, NEC

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 2

Components of a Complete RPR ProposalTopology Discovery

Protection Switching

RPR MAC

MAC Service Definition

Media Access Control

Frame Format

Transit Path

Bandwidth Mgmt.

OAM and Layer Mgmt

Bridging

PHY interfaceEthernet

SONET/SDH

jcf_topo_0x.pdf

jal_prot_0x.pdf

am_mrm_0x.pdf

hp_bwmgnt_0x.pdf

rb_phys_0x.pdf

hp_grs_0x.pdf

cb_layer_01.pdf

mh_brcom_03.pdf

rs_frame_0x.pdf

sa_transi_0x.pdf

ib_oamp_01.pdf

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 3

Objective• Satisfy the compatibility requirements as specified

in the 5 Criteria for 802.17“The Resilient Packet Ring standard will be compatible

with the relevant portions of 802.1D, 802.1Q and 802.1f”

• This proposal only demonstrates this compatibility– Not intended to mandate an implementation of bridging

for developers of 802.17

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 4

Outline• 802.17 bridge reference models

• MAC requirements for compatibility with 802.1D/Q

• Operation of an 802.17 MAC within a bridge

• Transmission of bridged frames on an 802.17 MAC

• Support for ISS and E-ISS by the 802.17 MAC

• Supporting Spanning Tree Protocol

• Conclusions

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 5

802.17 MAC in a Bridge• The station on the RPR is a transparent bridge and

the ring is the shared medium

Network Reference

RPR

MAC

LLC

MAC

LLC

MAC MAC

RELAY

MAC Bridge Reference

802.3802.17

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 6

802.17 Bridging Reference

MAC

LLC

MAC

LLC

MAC MAC

RELAY

MAC Bridge Reference

802.3802.17

MAC MAC

RELAY

802.3

S1 S2

RPRS1 S2

Network Reference

802.17 LAN

BRIDGE

Port

Port

802.3 LAN 802.3 LAN

BRIDGE

Port

Port

Bridged Local Area Network

S1 S2

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 7

802.1D/Q Assume a Broadcast Medium

• All 802 MACs operate as broadcast media• Bridging was designed to operate over broadcast media• The MAC in an 802 bridge operates in a mode that allows it

to process frames not destined to it– Referred to as promiscuous mode in the standards

• Bridging operates above the MAC– Need not be aware of protection happening at the MAC

layer• As long as a MAC can be operated as a broadcast medium,

STP, GVRP will function properly

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 8

MAC Requirements for Compatibility With 802.1D/Q

• MAC must support a promiscuous mode so that it allows the Relay Entity to process packets not destined to it

• Must handle frames with all types of addresses– Unknown unicast, multicast, broadcast

• Must be able to communicate with the Bridge Protocol Entity via the LLC sublayer

• Must be able support the Internal Sublayer Service (ISS) and the Extended ISS (E-ISS) defined in 802.1D and 802.1Q respectively

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 9

Operation of an 802.17 MAC in a 802.1D/Q Bridge

• The MAC must operate in promiscuous mode• All frames are “Replicated”

– The frame is “Dropped”, and– The frame is forwarded downstream if the TTL permits

Link BW Monitor entity

Link BW Monitor entity

Media AccessRate Policing Entity

Media AccessRate Policing Entity

802.17 MAC802.17 MAC

Link BW Monitor entity

Link BW Monitor entity

Media AccessRate Policing Entity

Media AccessRate Policing Entity

Link BW Monitor entity

Link BW Monitor entity

Media AccessRate Policing Entity

Media AccessRate Policing Entity

Link BW Monitor entity

Link BW Monitor entity

Media AccessRate Policing Entity

Media AccessRate Policing Entity

802.17 MAC802.17 MAC

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 10

Transmission of Frames by a Bridge on an 802.17 MAC

• All packets are broadcast on the ring

• Source address stripping cannot be used since the frame may have originated from off the ring

• TTL is used to limit the scope of the packet

RPR s1

TTL= 2

TTL= 3

RPR s1

TTL= 2

TTL= 3

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 11

Supporting ISS and E-ISS

LLC Entities

(Extended) Internal

Sublayer Service

(MAC method Dependent Functions)

MAC Entity

Higher Layer Entities

(Bridge Protocol Entity, Bridge Management, etc.)

MAC Relay Entity

(MAC Method Independent Functions)

LAN 1 LAN 2

(Extended) Internal

Sublayer Service

(MAC method Dependent Functions)

MAC Entity

LLC Entities

MAC ServiceMAC Service

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 12

Parameters for ISS and E-ISS Service Primitives

+

+

• Frame_Type• Mac_Action• DA• SA• RI• MSDU• User-Priority• Access_Priority• FCS

• Frame_Type• Mac_Action• DA• SA• RI• MSDU• User_Priority• FCS

Transparent Bridge (802.1D)

Request

Indication

Service Primitive

• Cluster_Id

• Cluster_Id

Remote Bridge

• CFI• VLAN_Class• RIF_Info• Include_Tag

• CFI• VLAN_Id• RIF_Info

SRT (Source Route Transparent)

Source Route Bridge

VLAN Bridge (802.1Q)

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 13

ISS Service Mappings for 802.17 MAC

FCS

MSDU

RPR HEADER Fields

SA

DA

MA-UNITDATA.request( frame_type, mac_action, DA, SA, Routing Information, MSDU, user_priority, access_priority, FCS)

MA-UNITDATA.indication( frame_type, mac_action, DA, SA, Routing Information, MSDU, user_priority, _____________ FCS)

Not Applicable

user_data_frame

request_with_no_response

Fixed mapping

802.17 Frame Fields

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 14

E-ISS Service Mappings for 802.17 MAC

Ethernet Type

Q-Tag

FCS

MSDU

RPR HEADER Fields

SA

DA

EM-UNITDATA.request( MA-UNITDATA.request.parameters, cfi, vlan_class, rif_info, include_tag )

EM-UNITDATA.indication(MA-UNITDATA.indication.parameters, cfi, vlan_id, rif_info )

VLAN Id

VLAN assigned to frame from Ingress Rules.

Determines inclusion of tag header derived

from Egress Rules.

802.17 Frame Fields

[ Optional ]

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 15

STP Interactions With 802.17

802.17 LAN (A)

Bridged Local Area Network

BRIDGE (s2)

Port

Port

BRIDGE (s3)

Port

Port

802.17 LAN (B)

BRIDGE (s1)

Port

Port

BRIDGE (s4)

Port

Port

802.3 LAN 1

BRIDGE

(s5) Port

Port

Port

802.3 LAN 3802.3 LAN 2Denotes blocking port state due to STP.

Network Reference

LAN 2 LAN 3

LAN 1

s5

s4

s3

s2s1

MAC MAC

RELAY

802.3802.17

S2

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 16

ConclusionsThis Proposal: Demonstrates 802.17 MAC compatibility with 802.1D

and 802.1Q as required by the PAR and 5 Criteria.

Other Proposals:There is no other proposal that demonstrates 802.17 compatibility with 802.1D and 802.1Q.

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 17

BackBack--up Chartsup Charts

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 18

802.1D Reference

LLC LLC

Filter DataBase

Port State Information

Port State Information

Frame Transmit

Frame Receive

Frame Transmit

Frame Receive

Bridge Protocol Entity

Forwarding Process

LAN 1 LAN 2

• Denotes Relaying MAC frames

• Denotes reception and transmission of BPDUs

(11/8/01) 802-17-01-00050, mh_brcom_03 Page 19

802.1Q Reference

LLC LLC

Filter DataBase

Port State Information

Frame Transmit

Frame Receive

Frame Transmit

Frame Receive

Bridge Protocol Entity

Forwarding Process

LAN 1 LAN 2

• Denotes Relaying MAC frames

• Denotes reception and transmission of BPDUs

Ingress Rules

Egress Rules

Port State Information