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8/8/2019 1610000 Stp Free Wnotes
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SPANNING TREE FREE NETWORK
January 2010
David Hawley and Srikanth Kilaru
8/8/2019 1610000 Stp Free Wnotes
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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
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3 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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?
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4 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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
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5 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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!
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6 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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
JUNIPER CONFIDENTIAL²NDA ONLY
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7 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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
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8 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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
JUNIPER CONFIDENTIAL²NDA ONLY
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9 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
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
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10 Copyright © 2009 Juniper Networks, Inc. www.juniper.net
USE SINGLE-TIER DATA CENTER FABRIC
ROUTERS,SWITCHES
SERVERS
APPLIANCES STORAGE
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