CIS 185 Advanced Routing ProtocolsEIGRP Part 2 pot

CIS 185 Advanced Routing Protocols

EIGRP Part 2

Rick Graziani

Cabrillo College

[email protected]

Fall 2012

2

EIGRP Part 2

 EIGRP over Frame Relay

 EIGRP over MPLS

 EIGRP Load Balancing

 EIGRP Bandwidth across WAN Links

 Authentication

 EIGRP Scalability in Large Networks

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Materials

 Book:

 Implementing Cisco IP Routing

(ROUTE) Foundation Learning

Guide: Foundation learning for the

ROUTE 642-902 Exam

 By Diane Teare

 Book

 ISBN-10: 1-58705-882-0

 ISBN-13: 978-1-58705-882-0

 eBook

 ISBN-10: 0-13-255033-4

 ISBN-13: 978-0-13-255033-8

Configuring and Verifying

EIGRP in an Enterprise WAN

Physical Frame-Relay

Multipoint and point-to-point Frame-Relay subinterfaces

Multiprotocol Label Switching (MPLS) virtual private

networks (VPNs)

Ethernet over Multiprotocol Label Switching (EoMPLS)

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Frame Relay Basics

 Frame Relay Basics

 A switched WAN technology

 Virtual circuits (VCs) are created by a Service Provider (SP)

 Multiple logical VCs to be multiplexed over a single physical interface.

 Typically PVCs identified by a locally significant data link connection

identifier (DLCI).

 For IP connectivity: A mapping between IP addresses and DLCIs must

be defined, either dynamically or statically. 5

Frame Relay Basics

 By default, a Frame Relay network is an NBMA network.

 Like multiaccess networks (Ethernet LANs) All routers are on the same

subnet

 But broadcast (and multicast) packets CANNOT be sent just once as they

are in a broadcast environment such as Ethernet.

 Cisco IOS implements pseudo-broadcasting

 Router creates a copy of the broadcast or multicast packet for each

neighbor reachable through the WAN media (over the PVC).

 Sends the copy of the broadcast or multicast packet over the appropriate

PVC for that neighbor. 6

EIGRP over Frame Relay:

Physical Interface with Dynamic Mapping

 Inverse ARP is on by default

 Automatically maps the IP address of the devices at the other end of the

PVCs to the local DLCI number.

 Split horizon is disabled by default on Frame Relay physical interfaces.

 Routes from Router R2 can be sent to Router R3, and vise-versa.

 Note: Inverse ARP does not provide dynamic mapping for the

communication between routers R2 to R3 because they are not

connected with a PVC; this must be configured (mapped) manually

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DLCI 100

DLCI 130

R1 Same Subnet

EIGRP over Frame Relay:

Physical Interface with Dynamic Mapping

 R1 forms the adjacency with router R2 and R3 over the serial0/0

physical interface.

 R3 (and R2) forms an adjacency with router R1.

 No EIGRP relationship exists between routers R2 and R3.

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EIGRP over Frame Relay:

Physical Interface with Static Mapping

 Using static mapping disables Inverse ARP

 No changes to the basic EIGRP configuration.

 Manual IP-to-DLCI mapping commands on the serial 0/0 interface are

necessary on all three routers.

 Again, because split horizon is disabled by default on Frame Relay

physical interfaces, routes from R2 can be sent to R3, and vise-versa.

 Note: R1 includes a Frame Relay map to its own IP address so it can

ping its own interface. 9

R1

interface Serial 0/0

encapsulation frame-relay

ip address 192.168.1.103 255.255.255.0

frame-relay map ip 192.168.1.101 130 broadcast

router eigrp 110

network 192.168.1.0

R3