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Extreme Fabric Connect

Паливода Александр

[email protected]

Системный инженер МУК


VistaPoint

Новый


Fabric Connect


Fabric Connect in a Single Slide

Based on IEEE 802.1aq

Basically a nextgen-ish VLAN– With an ID coded on 24bit

– Encapsulated in a Mac header (Mac-in-Mac 802.1ah)

Routed by IS-IS– Multipaths with no blocked path

– Loop free

– Symmetry & congruence

– Multicast & unicast

– QoS-aware

Core is transparent– Provisionning at the Edge only

Supported on most switches, from Core to Access

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Fabric Connect in a Picture

SPB extended

over WAN

(Fabric Extend)

Wiring Closet

CampusDistribution

Server Access (TOR)

Hypervisors

Data CentreDistribution

Branch Core

Internet

DMZ / Internet

SPB Backbone

(Fabric Connect)

Fabric

Attach

BEB

BEB

BEB

BEB

L2 BEBs L2 BEBs

BEB BEB BEB BEB

BEB BEBBEB BEB

BEB

BEB

BCB BCB

BCB BCB

FA Proxies FA Proxies

Fabric Attach

Wireless Access WLAN AP FA Clients


Fabric Connect

Fabric Connect is based on SPBM

– Long history with ex-Nortel Networks,

– Strong supporter of PBB (Mac-in-Mac) in the past

– Strong supporter of SPBM nowadays

Fair to say SPBM implementation by Avaya is the most

complete

– Full IEEE features

– Many proprietary implementations to go beyond

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Fabric Connect

Fabric Connect is based on SPBM– IEEE 802.1aq

– IETF RFC 6329

SPBM simplicity comes from its unique protocol infrastructure– Compared to multiple protocols stack for traditional networking

MPLS, VXLAN/BGP, etc.

Data Plane– Based on an Ethernet ISID

– « NG VLAN », more scalable and secure

Control Plane– Based on IS-IS routing

– IP/IPVPN services uses IP extensions

https://tools.ietf.org/html/draft-unbehagen-spb-ip-ipvpn-00

https://tools.ietf.org/html/draft-unbehagen-spb-ip-ipvpn-00


Fabric Connect

Fabric Connect is used for– Campus

– Metro

– DC Fabric

– DCI

Fabric Connect benefits– Service Provisioning at the Edge

– L2 & L3 service virtualization

– Shortest Path & Multi Path

– MAC scaling

– Fast Convergence

– Topology Independant


SPBM Frame Format

9


Fabric Connect

Dual-Homing support at the Edge

– SMLT any devices supporting LAG

– Extension to SPB 802.1aq


Fabric Connect

Fabric Connect relies purely on SPBM for discovery

– IS-IS forms adjacencies to neighbouring nodes,

– Discovers the core network topology,

– Then automatically calculates shortest paths from itself to every

other node in the network

– IS-IS programs forwarding entries in the BVIDs


Fabric Connect

Important Properties

– Shortest path based on link metrics with no blocked paths

– Reverse Path Forwarding Check (RPFC) eliminates loops

– Symmetric data path between any two nodes provides closed

OAM system

– Unicast path calculated from every node to every other node

– Ability to calculate service specific multicast delivery trees

– No IP configuration required inside the Fabric

– Network becomes a Virtual Switched Fabric


Fabric Connect

L2 Services

– IS-IS calculates the shortest path and programs the BMAC addresses into the FDBs

– A VLAN provisioned at the edge of the fabric is mapped into the Virtual Service Network using the Service Identifier (I-SID)

– IS-IS advertises all new services and communities of interest (I-SID information) to the network and the Forwarding Data Base is updated with I-SID Service specific entries


Fabric Connect

L2 Service VSN

– Congruent unicast & multicast paths

– Congruent forward & reverse path

Important Properties

– All traffic types (known, unknown traffic, broadcast) use same path; no out of orderpackets possible

– Traffic A -> B will follow same path as B -> A

– Multicast trees are ROOT-ed at source nodewithin every service instance and only flood packets to I-SID service node members

– No MAC learning & flooding in the Core

– Fully QoS aware infrastructure


Fabric Connect – L3 Service VSN

A Virtual Routing instance (VRF) provisioned at the edge of the fabric is mapped into the Virtual Service Network using the Service Identifier (I-SID)

IS-IS advertises all new services and communities of interest (I-SID information) to the network as well as the VRF IP routes which are only accepted and installed on other nodes in the same I-SID


Fabric Connect – VRF0 IP Shortcuts

Global Routing Table (GRT or VRF0) provisioned at the edgeof the fabric forwards standard IP packets over IS-IS in the SPBM core

IS-IS used to advertise IP route reachability and IP routes are installed in GRT/VRF0 IP routing table with next-hop shortcut to reach advertisingnode


Fabric Connect – SPB VSN Service Flexibility

Routing anywhere in the Fabric with L3VSNs (or GRT IP shortcuts)

Extend L2 VLANs anywhere inside or across the Fabric using L2VSNs


Fabric Connect – IP Multicast Services

A multicast stream received at the edge of the fabric is mapped into a dedicated multicast Service Identifier (I-SID)

– IGMP at the edge

– IS-IS in the fabric

– No need for PIM or DVMRP complexity

– Can be constrained within a L2 or L3 VSN

IS-IS advertises the stream to the rest of the fabric

– The stream is not forwarded until a receiver requests it and is forwarded ONLY to those receivers who requested it


Fabric Connect – SPB Fabric based Video Surveillance


Fabric Connect

Fabric NNI links can be extended

over Ethernet links or over IP

tunnels

All services can be seamlessly

extended


Fabric Connect – UNI Types

UNI Service classification types

– C-VLAN UNI with IP routing interface support

– Switched UNI

– Transparent UNI

– ETREE UNI

UNI Interface types

– Single port

– MLT/Distributed-MLT/LAG

– Split-MLT/vIST/MC-LAG


L2VSN – UNI Types: C-VLAN UNI

UNI is a VLAN

C-VLAN UNIs can have a routing interface

VLAN has global significance on the BEB

VLAN performs L2 switching on local VLAN port members & transports over L2VSN for remote end-points

Untagged traffic is assigned to VLAN corresponding to PVID configured on port

Not supported on DVR-leaf


L2VSN – UNI Types: Switched UNI

UNI is a VLAN ID on an ethernet port

VLAN ID has local significance on the ethernet port

Same VLAN ID can be re-used on different ports and belong to a different I-SID

Different VLAN ID on same or different ports can be assigned to same I-SID– Can do VLAN Mapping on local switch


L2VSN – UNI Types: Transparent UNI

UNI is an ethernet port

Ethernet UNI port is not VLAN tag aware

Packets with or without a VLAN tag are transported into the L2VSN


Data Center Spine-Leaf Fabric

Scale-out Data Center Fabric

– Distributed Routing Model: routing on the leaf


Fabric Connect and VXLAN

VXLAN HW Gateway (7254, 8284, 8404, 8600)– VXLAN Bridging (VLAN/ISID – VXLAN)

– VXLAN Routing (VLAN/VRF/ISID – VXLAN)

– VXLAN Overlay Fabric

– No Control Plane for VXLAN (static config)

RIOT support on Trident2-based switches– Requires to re-circulate the packets

– L3 bandwidth limitation of the (internal) ports used

– 480Gbps bidirectional (240Gbps in / 240Gbps out)

RIOT support on VSP 8600– Single-pass RIOT and linerate

– Fabric Connect support planned for End of 2017

– VXLAN GW planned for 1HCY18