Understanding Routing. Agenda What Is Routing? Network Addressing Routing Protocols.
Advanced IP Networking Series: “Routing The Network · PDF fileAdvanced IP Networking...
Transcript of Advanced IP Networking Series: “Routing The Network · PDF fileAdvanced IP Networking...
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Advanced IP Networking Series: “Routing The Network of Networks“
Wayne M. Pecena, CPBE, CBNE
Texas A&M University
Office of Information Technology
Educational Broadcast Services
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Advanced IP Networking Series: “Routing The Network of Networks “
• The Quick IP Networking Fundamentals Review
• The Routing Protocol
• Which Routing Protocol?
• Implementing Routing
• Access Control Lists
• The Layer 3 Switch
• Summary – Q&A
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Advertised Webinar Scope: Part 2 of Advanced IP Networking builds on the previous Network of Networks webinar by incorporating IP Layer 3 routing and selective access features utilizing Access Control Lists (ACL) to a VLAN-based layer 2 multiple network based infrastructure. Theoretical concepts of routing protocol choices and ACL implementation will be reinforced with real-world equipment configuration examples.
Prerequisite Knowledge: Attendees should have knowledge of IP networking concepts that includes OSI Layers 1-3, Ethernet switching, IP routing,
and VLAN principals.
WEBINAR OUTLINE:
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The Quick IP Networking Fundamentals Review
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5 Things Required To Build a Network
• Send Host
• Receive Host
• Message or Data to Send Between Hosts
• Media to Interconnect Hosts
• Protocol to Define How Data is Transferred
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Reference Models
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Application
Session
Presentation
Transport
Physical
Data Link
Network
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5
6
4
1
2
3
Transport
Internetwork
Network AccessProvides Media
Interface, Topology
Provides Data Sequencing, Flow Control, Integrity
Provides Logical Addressing, Fragmentation,
End-End Delivery
Provides Physical Addressing, Error
Correction
Service Provided to Applications
Provides Conversation Control
Provides Data Formatting
3
1
2
LLC
MAC
The OSI Model TCP/IP Model Encapsulation
Application4
IP
Network Interface
TCP UDP
Application Data
Segments
Bits
Frames
Packets
DoD Model
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Another Look at the “OSI Model”
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EMAIL RS-xxx
PPPIPv4TCP
25POPSMTP
Net Mgmt
File Transfer
WEB
Directory
SNMP
FTP
HTTP
DNS
161 / 162
20 / 21
80
53
UDPIPv6
802.2 SNAP
Ethernet II
ISDN
ADSL
Fiber
Coax
CAT 5
Application7
Presentation6
Session5
Transport4
Network 3
Data Link2
Physical1
Application Layers
Network Layers
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Layer 2 Standards:
• Project 802 Ethernet Standards:
– 802.1 Bridging
– 802.3 Ethernet
– 802.11 Wireless
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http://standards.ieee.org/about/get/
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Layer 3 Standards:
• Request for Comments – RFC’s – The “Standards Bible” of the Internet
– Explains All Aspects of IP Networking
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www.rfc-editor.org/rfc.html
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Layer 2 & Layer 3 Addressing
• Each Host on an Ethernet Based IP Network Has:
• An Unique MAC Address – Layer 2 Physical Address (local network segment)
• An Unique IP Address – Layer 3 Logical Address (global routed)
172.15.1.1 172.15.2.2 DATA Trailer00:12:3F:8D:4D:A7FF:FF:FF:FF:FF:FF
DestinationMAC
SourceMAC
DestinationIP
SourceIP
IP Packet
Ethernet Frame
Simplified Representation
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Common Port Numbers
• RESERVED PORTS
“System Port Numbers” • Port 20 / 21 – FTP “File Transfer Protocol”
• Port 23 – TELNET
• Port 53 – DNS “Domain Name Service”
• Port 80 – HTTP
• Port 110 – POP3 “Post Office Protocol”
• Port 123 – NTP “Network Time Protocol”
• Port 161 – SNMP “Simple Network Management Protocol” (UDP)
• Port 443 - HTTPS
• REGISTERED PORTS
“User Port Numbers” • Port 1720 – H.323 Video Call Setup
• Port 1812 – RADIUS Authentication
• Port 2000 – CISCO “Skinny”
• Port 3074 – “X-Box” Live
• Port 4664 – Google Desktop
• Port 5004 – RTP “Real Time Transport Protocol”
• Port 5060 – SIP “Session Initiation Protocol
• Port 5631 – PC Anywhere
• Port 8080 – Alternate HTTP
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http://www.iana.org/assignments/port-numbers
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Broadcast Domain – Collision Domain
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Layer 3 Routing Fundamentals
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Key Terminology
• The “Routed” Protocol
• The “Routing” Protocol
• The “Routing” Table Contains: – The Destination Network
– The “Next-Hop” Information
– Routing Metric & Administrative Distance
• The Router Looks at the “Destination” Address – Determines Appropriate Interface
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Routing
• Routing is Simply the Moving of Information Between Networks (Subnets or Broadcast Domains)
• OSI Model Layer 3 Process
• Routing Types:
– Static Routing
– Dynamic Routing
• Routing Protocol Classes:
– Interior Gateway Protocol (IGP)
– Exterior Gateway Protocols (EGP)
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Routing Types • Static Routing
– Appropriate for Small & Simple Networks – Minimal Router CPU/Memory – No Routing Update Overhead – Appropriate for Stable Networks – Often Used in “Stub” Networks – Human Intervention / Administration Required Yy
• Dynamic Routing – Appropriate for Changing Topology Environments
– Automatically Adapts to Changes
– Desirable When Multiple Paths Exist
– More Scalable
– Hardware More Complex
– Less Configuration Error Prone
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Dynamic Routing Categories
• Distance Vector Routing Protocol – Periodic Routing Table Updates
– “Distance” Used as a Metric
– Neighbors “Trust” Neighbors
– Slow Convergence
• Link State Routing Protocol – Maintains Neighbor, Topology, & Shortest-Path Tables
– Each Router Updates From All Others
– “Cost” Used as a Metric
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Routing Metrics & Administrative Distance Determines The Best Path to Target Host
• Cost Metrics: – Hop Count The Number of Routers in a Path
– Bandwidth Throughput (bps)
– Load Traffic Flowing Through a Router
– Delay Network Latency (distance or congestion)
– Reliability Amount of Downtime of a Network Path
• Administrative Distance – Indicates Believability of the Route
– Often Used When Multiple Protocols Are Used
– Often Used to Prefer A Certain Path When Multiple Paths Exist
– Routing Protocols Have Default Administrative Distances
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Smaller Metrics = Best Route Lower Administrative Distance = More Believed
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The “Administrative” Distance
• The Administrative Distance Determines Which Route to Trust
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Route Source: Administrative Distance (default)
Direct 0
Static 1
EIGRP 90
OSPF 110
RIP 120
Unknown 255
Used When Multiple Routes Exist
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Hop Count May Not Be The Best Metric!
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The Routing Protocol
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The Routing Protocol
• Learn the route to each subnet in the internetwork (build routing table)
• Determine the “best’ route (one route)
• Remove routes that are no longer valid
• Update routing table to reflect changes
• Perform updates quickly
• Prevent routing loops
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Routing Fundamentals
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Distance-Vector Routing Protocols
• “Routing by Rumor” – The Overall Network is Unknown, Only Directly Connected Neighbors Are Known by Each Router
• Routing Decision Based Upon a “Distance” or Metric and “Direction” or Vector to Describe the “Next-Hop”
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Link-State Routing Protocols
• Network Topology Information is Flooded Throughout the Network
• Each Router Determines its Own “Best Path”
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Which Routing Protocol?
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IGP and EGP Protocols
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ExteriorGatewayProtocol
InteriorGatewayProtocol
InteriorGatewayProtocol
IS-IS BGP
RIP IGRP
EIGRP OSPF
RIP IGRP
EIGRP OSPF
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Routing Protocol Choices “Most Popular”
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Interior Distance Vector
Interior Link State Exterior Path Vector
Classful RIP IGRP EGP
Classless RIP v2 EIGRP OSPF v2 IS-IS BGP v4
IPv6 RIPng EIGRP v6 OSPF v3 IS-IS v6 BGP v4
Our Focus
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Practical Routing Protocol Choices “Common” IGP Protocols – VLSM Support
RIP v2 EIGRP (Cisco) OSPF v2
Type: Distance Vector Hybird Link-State
Metric: Hop Count Bandwidth/Delay Cost
Administrative Distance:
120 90 110
Hop Count Limit: 15 224 None
Convergence: Slow Fast Fast
Updates:
Full Table Every 30 Seconds
Send Only Changes When Change Occurs
Send Only When Change Occurs, But Refreshed Every 30m
RFC Reference: RFC 1388 N/A RFC 2328
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RIP v2 Routing Information Protocol
RFC 1388
• Advantages: – Simple – Easy to Configure
– Low Maintenance
– General Understanding Of
• Disadvantages: – Higher Router CPU Utilization
– High Bandwidth Use for Routing Updates
– No Knowledge of Link Bandwidth
– Slow Convergence
– Limited Network Size (hop count = 15)
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OSPF v2 Open Shortest Path First
RFC 2328
• Advantages: – Fast Convergence
– Routing Updates Are Small
– Scales to Varying Network Sizes
– Considers Link Bandwidth Into Metric Calculation
• Disadvantages: – More Knowledge Required – A lot of Options
– Complex to Configure
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EIGRP v4 Enhanced Interior Gateway Routing Protocol
CISCO Proprietary
• Advantages: – Fast Convergence
– No OSPF Area Assignments = Less Complex
– Complex Cost Metric: • Bandwidth
• Delay
• Reliability
• Utilization
• Disadvantages: – More Knowledge Required – A lot of Options
– Need “Cisco” Environment
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Implementing Routing
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VLAN Example from Part 1
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Switch Port Type Configuration:
Access Link – Member of One VLAN Only Connects to a Host Trunk Link – Carries Traffic From Multiple VLANS Between Switches
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Switch Interface Configuration
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No Connectivity Exists Between Broadcast Domain, Networks, or Subnets!
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Add Connectivity Between Broadcast Domains
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Add Router
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Router Configuration:
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Configuration Disclaimer: Exact configuration commands may vary based upon specific equipment models and software version. Generic “Cisco” commands utilized for illustration purposes.
Blue Network: 192.168.100.0 /24 Green Network: 192.168.200.0 /24 Red Network: 192.168.300.0 /24
Assign Network to an Interface: interface ge0 ip address 192.168.100.1 255.255.255.0 no shutdown interface ge1 ip address 192.168.200.1 255.255.255.0 no shutdown interface ge2 ip address 192.168.300.1 255.255.255.0 no shutdown
Enable RIP Routing: router rip network 192.168.100.0 network 192.168.200.0 network 192.168.300.0
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Add Connectivity Between Broadcast Domains
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Sub-Interface Created on Router GE1 Interface
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Access Control Lists The “ACL”
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The “ACL” Rules:
• Simply a “Set of Rules” That Provides a “Permit” or “Deny” Based Upon: – Layer 3 IP Address
– Layer 4 Port Number
• An ACL is: – A Table (with explicit DENY)
– Applied to a Specific Router Interface
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The “ACL” Rules continued…..
• ACL’s can be Numbered or Named
• Numbered ACL’s Structure: – 1-99 IP Standard Access List
– 100-199 IP Extended Access List
– 200-299 Protocol Access List
– 1300-1999 IP Standard Access List-Expanded
– 2000-2999 IP Extended Access List-Expanded
• Named ACL Structure: – Standard Named
– Extended Named
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The “ACL” Rules continued…..
• Standard Access List – Can Only Permit or Deny The Source Host IP Address
– Placed Closest to Destination Host
• Extended Access List – Can Permit or Deny Based Upon:
• Source IP Address
• Destination IP Address
• TCP Port #
• UDP Port #
• TCP/IP Protocol
– Placed Closest to Source Network
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The “ACL” Rules continued…..
• One “ACL” per Interface per Direction – Ingress
– Egress
• An ACL Only Acts of IP Traffic Passing Through Router
• Organize Structure of ACL: – More specific statements placed first
– Process Sequentially
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ACL Example(s): access-list 110 deny ip any host 192.168.100.110 access-list 123 deny ip any host 192.168.100.110 eq 23
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ACL Structure
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Create an Access-List:
access-list [number] [deny | permit] [host] [source ip] [wildcard]
Apply Access-List to Interface:
ip access-group [number] [in | out]
Logical Operators Can Be Used:
lt Less Than gt Greater Than eq Equal To neq Not Equal To range port number range
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Wild Card Mask
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Inverse of the “Subnet” Mask
The Subnet Mask:
192.168.100.100 / 24 or
192.168.100.100 mask 255.255.255.0
The Inverse Mask:
0.0.0.255
Network Host
Match Don’t Care
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Standard IP List Example #1: Prevent Host 192.168.30.30 from Accessing Host 192.168.10.10
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Create Access List on Router 1: access list 101 192.168.30.30 0.0.0.0 access-list 101 permit any Apply Access List to Interface: interface E1 ip access-group 101 in
Configuration Disclaimer: Exact configuration commands may vary based upon specific equipment models and software version. Generic “Cisco” commands utilized for illustration purposes.
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Extended IP List Example: Allow Only http Access to Host 192.168.10.10 from 192.168.30.0 /24
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Create Access List on Router 2: Access-list 101 permit tcp 192.168.30.0 0.0.0.255 host 192.168.10.10 eq 80 access-list 101 permit ip any any Apply Access List to Interface: interface E0 ip access-group 101 in
Configuration Disclaimer: Exact configuration commands may vary based upon specific equipment models and software version. Generic “Cisco” commands utilized for illustration purposes.
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A “Practical” ACL Example Block External Users From “Pinging” Inside Hosts
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Create Access List on Router 1: access list 101 deny icmp any any access-list 101 permit ip any any Apply Access List to Interface: interface E1 ip access-group 101 in
Configuration Disclaimer: Exact configuration commands may vary based upon specific equipment models and software version. Generic “Cisco” commands utilized for illustration purposes.
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The Layer 3 Switch
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What Is A “Layer 3” Switch? • “Marketing Terminology” Applied to a One Box Solution:
– Layer 2 Switching
– Layer 3 Routing
• Layer 3 Switch Performs Both!
• Multilayer Switch Port Types:
– Switchport: Layer 2 Port – MAC Addresses Learned
– Layer-3 Port: Routing Port
– Switched Virtual Interface: VLAN Virtual Interface
• Not for All Environments:
– Typically Found in Workgroup Environment
– Limited to Ethernet Ports/Interfaces
– Limited to OSPF and RIP Protocols
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Summary Q & A
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Takeaway Points • Routers Create “Broadcast Domains”
• Routing is Moving an IP Packet from One Network to Another Network
• Static & Dynamic Routing Each Have Advantages & Disadvantages
• The Routing Protocol Determines the Best Path to a Destination Host
• ACL’s Can Be Used to Control IP Traffic
• A Layer 3 Switch Combines Layer 2 Switching & Layer 3 Routing in One Box
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Further Study:
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SBE Networking Certifications CBNT Certified Broadcast Networking Technician
• This certification is designed for persons who wish to demonstrate a basic familiarity with networking hardware as utilized in business and audio/video applications in broadcast facilities.
• Exam Focus: – Network topologies and layouts – Common network protocols – Wiring standards and
practices – Maintenance, troubleshooting and
connectivity issues – Challenges unique to broadcast-
based networks
CBNE Certified Broadcast Networking Engineer
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• This certification is an “Advanced” level that reflects the skill and knowledge that will be required in today's world of converged IT and broadcast engineering.
• Exam Focus: – Audio/Video over IP
– Digital Content Management
– Video Systems in an IT World
– Data Transmission Systems
– General IT Hardware
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Thank You for Attending! Wayne M. Pecena Texas A&M University [email protected] [email protected] 979.845.5662
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? Questions ?