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SPANNING TREE FREE NETWORK

January 2010

David Hawley and Srikanth Kilaru



2 Copyright © 2009 Juniper Networks, Inc. www.juniper.net

SSL VPN

Firewall

IPSec VPNIPS

L2Switch

L2/L3Switch

L2/L3Switch

L2/L3Switch

STP IN A LEGACY DATA CENTER NETWORK

WAN EdgeRouter

WAN EdgeRouter

Servers +Storage

Too many

devices andlayers1Too many

operating

systems2

High latency3

Uptime is a

challenge4

Takes too long

to deploy

anything5

L2/L3Switch

Hard to manage

STP in a flat L2

access network

Security Sprawl

WAN Edge

Core Tier

AggregationTier

Access

Tier




LAYER 2 IN THE DATA CENTER

Layer 2 Benefits Ease of deployment (plug-and-play)

Location-independent addressing

No address management required

Network segmentation uses VLANs

Application Requirements

Often require ability to broadcast topeers

Server Virtualization (vMotion, etc.)requires L2 adjacency

FCoE (converged LAN/SAN) runsover L2

Layer 2 Challenges Redundant links form network loops

Loops are difficult to isolate andcause network failure

STP used to remove loops, butcauses inefficient link utilization

STP configuration errors are

catastrophic and hard to debug Broadcast storms impact traffic

across L2 domain

Layer 2 Scaling

Customers limit size of L2 domain tomanage STP, convergence times

vMotion limited to 64 servers Customers look to alternate

technologies to avoid loops

HOW TO DEPLOY L2 IN DATA CENTER WITHOUT STP?




EX 8200

USE SCALABLE L2/L3 ACCESS LAYER

MX Series

EX4200

SRX5800

Use EX4200 tocreate top-of-rackVirtual Chassis

EX4200 Virtual Chassissupports up to 480 GbEports

EX4500 Virtual Chassis

supports up to 28810GbE server ports*

Use EX8200 for high-density end-of-row chassis

Single EX8200supports up to 768GbE ports

Single EX8200supports 640 10GbEports*

EX8200

L2/L3 Boundary

ECMP

EX4500

JUNIPER CONFIDENTIAL²NDA ONLY

*SOPD




USE SCALABLE L2/L3 ACCESS LAYER

Limit L2 and VLANs to single chassis No loops, no STP

ECMP used for uplinks ± no license for L3

on EX data center products

Up to 400 servers with one Virtual Chassis

Over 500 servers with one EX8200

Same architecture for GbE and 10GbE

servers

Application Requirements

Allows applications to maintain L2

adjacency within single switch

Servers typically co-located within single

row

VLAN boundary at access layer for lowlatency application data transfer

Virtual Chassis Extension allows distant

servers to be accommodated

L2/L3

VirtualChassis

Wire-rate10GbE

Core

Access

Cisco L2-only:35µs VLAN to

VLAN latency

Juniper L2/L3 access: 3.6µs VLAN-

VLAN latency. 10x faster than Cisco!




EX8200Virtual

Chassis

USE EX8200 VIRTUAL CHASSIS IN AGGREGATION /CORE LAYER

MX Series

EX4200

SRX5800

EX8200

L2/L3 Boundary

EX4500

Use EX8200Virtual Chassis tocreate two-tier STP-free L2domain

Two-member EX8200Virtual Chassissupports up to 240line-rate 10GbEuplink ports

EX8200 VirtualChassis supportsover 10,000 5:1 O/SGbE server ports

EX8200 VirtualChassis supportsover 1,000 5:1 O/S10GbE server ports

LAG





EX8200 VIRTUAL CHASSIS IN AGGREGATION / CORE

EX8200 Virtual Chassis Architecture Multiple systems behave as single

Virtual Chassis

Multi-chassis links treated as LAG

with all links active

Eliminates STP and VRRP

Dual external REs provide controlplane scaling and high availability

Standard line-rate 10GbE ports used

for intra-Virtual Chassis links

Application Benefits

Allows applications to maintain L2

adjacency across dispersed pool of compute resources

Servers can be placed throughout

data center or across data centers

Product EX8200Virtual

Chassis

NX7000vPC

Cat6509VSS

NortelSMLT

Line rate

10G Ports128/256 128/256 60 48

Unified

control &

mgmt

plane?

Yes No Yes No

Intra-

system link

failure

No

network

failure

Network

failure

Network

failure

Network

failure

Eliminates

VRRP,HSRP Yes No Yes No

Control

plane

modified?

No Yes Yes Yes




L2 trunk

VPLS

EX8200Virtual

Chassis

USE MX TO SPAN L2 BETWEEN DC USING VPLS

MX VirtualChassis

EX4200

SRX5800

EX8200

L2/L3 Boundary

EX4500

Use MX to deliver inter-DC mobilityover MPLS/VPLS

Proven technology for tunneling L2 over MPLS connections

VPLS supports VMlive migration acrossmetro region

Supports L2 tunnelingacross WAN

MX supports VirtualChassis technology(SOPD)

LAG

Routeduplink





SCALABLE VIRTUAL MACHINE MOBILITY

Virtual Chassis

Rack A Rack B

RACK TO RACK

Layer 2 domain across racksand across data center

Data Center Data Center

Virtual Chassis Extension

SITE TO SITE

Layer 2 domain acrossfiber connected data centers

Cloud Center Cloud Center

CLOUD TO CLOUD

VPLS

Layer 2 domain acrossvirtual private LAN

WP: Implementing VMWARE Server Virtualization




USE SINGLE-TIER DATA CENTER FABRIC

ROUTERS,SWITCHES

SERVERS

APPLIANCES STORAGE

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