Routed access in the campus network provides three main benefits: 1) It increases network resiliency for applications like VoIP by utilizing routing protocols instead of spanning tree. 2) It simplifies network configuration and troubleshooting by using a single control plane instead of multiple redundant protocols. 3) It improves load balancing and network utilization by distributing traffic across multiple equal-cost links using routing.

1. Routed Access in the
Campus Network
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2. Cisco’s Technology Vision:
The Intelligent Information Network
Integrated
Applications
Network-Enabled
Applications Get More Value
Network Intelligence
Integrated
from Applications
Services
Phase 3
Virtualized Resources and Get More Value
Services
from Infrastructure
Integrated Phase 2 and Resources
Transport
The Intelligent Movement of Data/Voice/Video
across a System of Networks Get More Value
from the Network
Phase 1 Foundation
Time
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3. The Market
“Resources are tight. A complex network
infrastructure will only further drain those
resources. To prepare, strive for simplicity
and uniformity.”
CIO Magazine
“... a collaboration analyst at Forrester, concurs.
“It’s undeniable that electronic communication and
collaboration between companies is increasing,…”
CIO Magazine
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4. Challenges
• Real-time applications are driving
network needs
VoIP, IP Video, Converged networks,
CRM and Instant Messaging
• Network recovery and downtime
are critical
Downtime is expensive
Five and Six 9s reliability
• Network complexity delays services
integration
• IT responsible for driving business
process
CRM, Mobility and Access to Data
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5. Network Have Been Built for
Client-Server Applications
Core • Hierarchical
Decreasing Intelligence
traffic: desktop
Si Si to server
• Non real-time
Distribution
• Centralized
Si Si Si Si
• Data only
• Rule of 90–10
Access
Valuable Services are Closer to the Servers
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6. What Is High Availability?
Availability DPM Downtime Per Year (24x365)
99.000% 10000 3 Days 15 Hours 36 Minutes
99.500% 5000 1 Day 19 Hours 48 Minutes
99.900% 1000 8 Hours 46 Minutes
99.950% 500 4 Hours 23 Minutes
99.990% 100 53 Minutes
99.999% 10 5 Minutes “High
1 Availability”
99.9999% 30 Seconds
DPM—Defects per Million
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7. What If You Could…
Reduce Cost Through Diminished Risk of Downtime
• Costs for downtime are high Revenue/
Industry Sector Revenue/Hour Employee-
One day cost of lost productivity = Hour
$1,644 per employee
Energy $2,817,846 $ 569
100 person office =
$164K per day Telecommunications $2,066,245 $ 186
• More than just a data Manufacturing $1,610,654 $ 134
network outage
Financial Institution $1,495,134 $1,079
• More than just revenue impacted
Insurance $1,202,444 $ 370
Revenue loss
Retail $1,107,274 $ 244
Productivity loss
Impaired financial performance Transportation $ 668,586 $ 107
Damaged reputation Average $1,010,536 $ 205
Recovery expenses Source: Meta Group
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8. Routed Access in the Campus
• Routing in the campus access layer
• Utilizes EIGRP/OSPF for routing services
• Spanning Tree Protocol is not used
• Provides
Si Si
Increased resiliency for VoIP and
Maximize your existing redundant
connections
Less configuration complexity Layer 3
Common troubleshooting tools Si
Layer 2 Si
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9. Multilayer Network Design
Without a Rock Solid Foundation the Rest Doesn’t Matter
Access
• Offers hierarchy―each layer has
specific role
• Modular topology―building blocks
Distribution
• Easy to grow, understand, and Si Si
troubleshoot
• Creates small fault domains―
Clear demarcations and isolation
Core • Promotes load balancing and redundancy
Si
Si
• Promotes deterministic traffic patterns
• Incorporates balance of both Layer 2
Distribution and Layer 3 technology, leveraging the
strength of both Si Si
• Utilizes Layer 3 Routing for load
balancing, fast convergence, scalability,
Access and control
Data Center
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10. Routed Campus Access Layer
• VLANs are isolated to Wiring Closet
• Stub routing in Access, no STP or HSRP/VRRP
• Faster convergence and better load balancing
• Topology could be the same… or…
Distribution
Layer 3
Stub
Access Routing
Layer 3
Subnets
3 4 6 7 8 9
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11. Routed Access Design
Structured Design Foundation
• EIGRP or OSPF routed links between access and distribution
• Routed interfaces, not VLAN trunks, between switches
• Equal cost multi path to load balance traffic across network
• Route summarization at distribution (like L2/L3)
• Single control plane to configure/manage (no STP or HSRP)
EIGRP or OSPF Si Si
Equal Cost Multi Distribution
Path
Layer 3
Si
Layer 2 Si Access
10.1.20.0 VLAN 20 Data 10.1.40.0 VLAN 40 Data
10.1.120.0 VLAN 120 Voice 10.1.140.0 VLAN 140 Voice
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12. Keep Redundancy Simple
“If Some Redundancy is Good,
More Redundancy is NOT Better”
• Root Placement?
• How Many Blocked Links?
• Convergence?
• Complex Fault Resolution
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13. Ease of Implementation
Less to Get Right
• No STP feature placement core
to distribution
LoopGuard
RootGuard
STP Root
• No default gateway redundancy
setup/tuning
• No matching of STP/HSRP/GLBP
priority
• No L2/L3 multicast topology
inconsistencies
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14. Ease of Troubleshooting
• Routing Troubleshooting Tools
Show ip route
Traceroute
Ping and extended pings
Extensive protocol debugs
Consistent troubleshooting; access, dist, core
• Bridging Troubleshooting Tools
Show ARP
Show spanning-tree, standby, etc…
Multiple show CAM dynamic’s to find a host
• Failure Differences
Routed topologies fail closed—i.e. neighbor loss
Layer 2 topologies fail open—i.e. broadcast and unknowns flooded
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15. Advantages of Routed Access
In the Right Environment
• EIGRP and OSPF converge in <200 msec
• OSPF convergence times dependent on timer tuning
• RPVST+ convergence times dependent on GLBP/HSRP tuning
2
1.8
1.6
Upstream
1.4
Downstream
Seconds
1.2
1
0.8
0.6
0.4
0.2
0
RPVST+ OSPF EIGRP
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16. Multicast Routed Access Campus Design
Things You Don’t Have to Do…
• Tune PIM query interval for designated router convergence
• Configure designated router to match HSRP primary
• Configure PIM snooping on L2 switches between L3 switches
• Worry about all those L2/L3 flow inconsistency issues
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17. Routed Access Considerations
• Do you have any Layer 2 VLAN adjacency
requirements between access switches?
• IP addressing—do you have enough address
space and the allocation plan to support a
routed access design?
• Platform requirements
Catalyst 6500 requires an MSFC with hybrid (CatOS and
Cisco IOS®) in the access to get all the necessary switch
port and routing features
Catalyst 4500 requires a SUP4 or higher for EIGRP or OSPF
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18. Why Routed Access Campus Design?
Si Si
Distribution
Layer 3 Access
Si Layer 2 Si
• Most Enterprise Catalysts® support L3 switching today
• EIGRP/OSPF routing preference over spanning tree
• Single control plane and well known tool set
Traceroute, show ip route, sho ip eigrp neighbor, etc…
• IGP enhancements; stub router/area, fast reroute, etc..
• It is another design option available to you
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19. Hierarchical Campus Design
Routed Access Building Blocks
•• Network trust boundary
Network trust boundary
•• VLANs are contained to the access switch
VLANs are contained to the access switch
Access •• Use EIGRP or OSPF on interfaces to
Use EIGRP or OSPF on interfaces to
distribution layer
distribution layer
•• Use parallel paths for Equal Cost Multi Path (ECMP)
Use parallel paths for Equal Cost Multi Path (ECMP)
routing
routing
•• Use EIGRP stub routers or OSPF stub areas to limit
Use EIGRP stub routers or OSPF stub areas to limit
Distribution scope of convergence events
scope of convergence events Si Si
•• Access layer aggregation
Access layer aggregation
•• Route summarization to the core to minimize
Route summarization to the core to minimize
routing events
routing events
Core
•• Route filtering from the core to minimize routing
Route filtering from the core to minimize routing Si Si
table size in access
table size in access
•• OSPF stub area border (ABR)
OSPF stub area border (ABR)
•• Keep your redundancy simple; equal cost
Keep your redundancy simple; equal cost
load balancing between access and core
load balancing between access and core
Distribution •• Vary CEF algorithm to prevent polarization
Vary CEF algorithm to prevent polarization
Si Si
•• Highly available and fast—always on
Highly available and fast—always on
•• Deploy QoS end-to-end: protect the good and
Deploy QoS end-to-end: protect the good and
Access punish the bad
punish the bad
•• Equal cost core links provide for best convergence
Equal cost core links provide for best convergence
Data Center
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20. Who Can Benefit
Enterprise Customers Who Are
• Implementing VoIP, IP video
or collaboration applications
• Looking to improve network availability
• Wanting to decrease network complexity
• Standardizing on one set of protocols
for the network
• Easing the growing burden of network
configuration and maintenance
• Implementing CRM or databases
company wide
• Increasing intelligence into the wiring closet
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21. Water Agency Improves Network Availability
San Antonio Water Systems
• Customer Challenges
Alleviate bandwidth constraints
at network edge
Improve network availability and
database application performance
Maintain operation costs
• Solution
Routed Access solution with Layer 3 “Routed Access
routing capability in the wiring closet eases our management
• Net Multiplier Effect burden and makes
Halves network complexity and it much easier to
reduces network management burden implement new
Reduces new service implementation
projects.”
costs by 25%–30%
Darrin Gannaway,
Doubles bandwidth, eliminates congestion Senior Network Engineer
and improves security with minimal capital
outlay
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22. Investment Protection
• Maximize equipment you have today
• Supported in Catalyst wiring closet switches for Enterprise
Catalyst 3560 and 3750
Catalyst 4500
Catalyst 6500
• EIGRP stub included in Catalyst base image
• Existing protocols and management interfaces
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23. Supporting Solution
Routed Access in the Catalyst Switching Portfolio
Features, Scalability, Longevity
e
tion/Cor
Distribu Catalyst 6500
Catalyst 4500
Access
Datacenter
Catalyst 6500 Routed
Access
Catalyst Routed
4948 Routed Access
Routed Access
Blade Switches
Access
loset
Wiring C Catalyst 6500
Catalyst 4500
Catalyst 3750
Catalyst 3560
Catalyst 29xx
Catalyst Express 500
Small Medium-sized Large
Number of Employees/Density
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24. Cisco Catalyst Switching
Enhanced Performance and Service Enablement
Deterministic Predictable
Business Integrated Application Simplified
Continuity Security Performance Operations
• Real-time recovery • Perimeter defense • Layer 2/3/4 traffic • Real-time
classification troubleshooting
• High-availability at • Identity-based
(QoS) and traffic
the network trust and identify
monitoring
equipment level management • Multicast for new
applications • Configuration
• High-availability at • Pervasive security
automation
the network design connectivity • Hardware-based
level services wire-speed • Standardization
performance on fewer protocols
• Resiliency at the • Secure
network protocol management • Intelligent power
level management
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25. Cisco Is Your Partner for
Delivering Intelligent Networks
• More than 1600 support
engineers, 40 percent with
CCIE® certification
• Average 15 years’ experience
• 80 percent issues resolved online
• Highest level of customer
satisfaction
• Multiple awards for service
• 30,000 Technical Assistance
Center(TAC) cases per month
• 5000+ partners worldwide
deliver direct and subcontracted
services for Cisco technology
• 1200+ partner-employed CCIEs
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26. Routed Access Summary
• Real-time applications are
driving network needs
VoIP, Video, Triple play networks,
CRM and IM
• Network recovery and downtime
are critical
Downtime is expensive
Five and Six 9s reliability
• Routing in the wiring closet delivers
Decreased downtime
Predictable recovery from failure
“Less to get right”
Fewer protocols to troubleshoot
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