Hierarchical Network Models
Advantages
- Cost savings
- Ease of understanding becausee of simple design and lower management costs as monitoring systems are distributed.
- Network growth as changes are contained to a small subset of the network and only impact that small area
- Easy to isolate a problem in the network if the hierarchial model is used
- Facilitates route summarization
Hierarchial Network Design for the LAN
- Core
- Fast switching backbone
- QoS
- Redundancy
- network Diameter (router hops from edge to edge) should be consistent
- Distribution
- Policy-based connectivity
- Redundancy
- QoS
- Security
- Media translation
- Route aggregation
- Access
- Network access
- Port Security
- VACL
- POE
- Layer 2 switching
- High Availability
Hierarchial network design inplementation:
- Switched design
- Core – High speed switching
Route Summarization
- Distribution – Layer 3 boundary + Redundancy + Policies + InterVLAn + Route Summary
- Access – STP
- Routed design
- Core – Layer 3 switching
Route Summarization
- Distribution – Layer 3 Boundary + Filtering towards access +Policing + summarization towards core
- Access
Virtual Switching System VSS (Cisco 6500) can be used to replace STP and need for Redundancy protocols.
Cisco Enterprise Architecture model
Used for more scalable networks
- Enterprise Campus Area
- Core –
- Distribution
- Access
- Data Center
- Enterprise Edge Area
- E-commerce – servers, IPS,Firewalls
- DMZ – Firewalls, FTP HTTP Servers SMTP
- WAN
- VPN – ASA, IPS, Firewalls
- SP Edge Module
- Internet
- WAN
- PSTN
- Remote
- Branch
- Data Center
- Teleworkers
Borderless Network Services
- Mobility
- Cisco Motion
- Security
- Cisco TrustSec
- Cisco ASA
- Cisco Virtualization Security
- Cisco Anyconnect
- Cisco SAFE
- Application Performance
- Application Velocity
- WAAS
- IP Comm
- Cisco VideoStream
High Availability Network Services
- In Access Layer
- ARP
- Explicit Configuration
- RDP
- RIP
- HSRP
- VRRP
- GLBP
- Server Redundancy
- HSRP, GLBP
- NIC – dual attachment
- Fast EtherChannel and Gigabit EtherChannel
- Router Redundancy
- Availability
- Load balancing
Link Media Redundancy
- STP
- VSS
CyberSecFaith 