© 2011 Internetwork All rights reserved. Cell: +20 10 09517999 Email : [email protected] Samir CCNP-SWITCHING 250-111 Mohamed Samir YouTube

© 2011 Internetwork All rights reserved. Cell: +20 10 09517999 Email : [email protected] Mohamed Samir

CCNP-SWITCHING 250-111Mohamed Samir YouTube channel

Double CCIEs #27042(R/S&SP)


CCNP-SWITCHING 250-111Course Overview


Switching overview

• 23 chapter• Part I Designing Campus Networks• Part II Building a Campus Network• Part III Working with Redundant Links• Part IV Multilayer Switching• Part V Monitoring Campus Networks• Part VI Implementing High Availability• Part VII Securing Switched Networks


Part I: Designing Campus Networks


Designing Campus Networks

• Predictable Network Model should offer low maintenance and high availability.

• You should scale the network to easily support future expansions and upgrades

• efficiently connecting users with the resources they need, regardless of location

• Cisco has refined a hierarchical approach to network design to be efficient, intelligent, scalable, and easily managed.


Hierarchical Design

• Access Layer:• exists where the end users are connected to the network.

Access switches usually provide Layer 2 (VLAN) connectivity between users

• Low cost per switch port• High port density• Scalable uplinks to higher layers• High availability• Ability to converge network services (that is, data, voice, video)• Security features and quality of service (QoS)


Hierarchical Design

• Distribution Layer:• provides interconnection between the campus

network’s access and core layers.

• Aggregation of multiple access layer switches• High Layer 3 routing throughput for packet handling• Security and policy-based connectivity functions• QoS features• Scalable and redundant high-speed links to the core and

access layers


Hierarchical Design

• Core Layer:• provides connectivity between all distribution layer

devices. The core, sometimes referred to as the backbone

• Very high Layer 3 routing throughput• No costly or unnecessary packet manipulations (access

lists, packet filtering)• Redundancy and resilience for high availability• Advanced QoS functions


Hierarchical Design

• You can divide enterprise campus networks into the following

• Switch block: A group of access layer switches, together with their distribution switches

Usually, no more than 2000 users should be placed within a single switch block.

Core : The campus network’s backbone, which connects all switch blocks.


Hierarchical Design

• Switch Block Redundancy• two independent power supplies.• implement most of the components in

redundant pairs• The two distribution switches can use one of

several redundant gateway protocols to provide an active IP gateway

• Best Practice Loop-Free Switch Block Topology


Hierarchical Design

• Network Core

• connect two or more switch blocks in a campus network• foundation and carries much more traffic than any other

switch block.• Preferably, the links between distribution and core layer

switches should be Layer 3 routed interfaces• Redundant links connect each switch block’s distribution

layer portion to each of the dual core switches


Hierarchical Design

• Collapsed Core

• Should all networks have a distinct redundant core layer?

• A collapsed core block is one in which the hierarchy’s core layer is collapsed into the distribution layer

• Cisco Products in a Hierarchical Network Design


Any questions ?


Thank you for your time !

شكرا

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© 2011 Internetwork All rights reserved. Cell: +20 10 09517999 Email : [email protected] Samir CCNP-SWITCHING 250-111 Mohamed Samir YouTube