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EIGRP
LSNDI RMRA
MM Clements
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LSNDI RMRA2 4 Feb 2008
Last Week ………
OSPF requires more resources from router Fast convergence Less overhead – good for large networks LSAs sent in LSUs – only the changes are
flooded to the network Supports VLSM Complex to configure!
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LSNDI RMRA3 4 Feb 2008
This week……….
EIGRP – Cisco proprietary routing protocol Key features Neighbor and topology tables Feasible Distance & Successor Routes EIGRP packet types Setting up EIGRP
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LSNDI RMRA4 4 Feb 2008
Enhanced Interior Gateway Protocol
Released in 1994 as successor to IGRP Compatible with IGRP Hybrid routing protocol with best of distance
vector & link-state algorithms Uses partial updates and neighbour discovery Like OSPF but easier to configure Good for large multiprotocol networks that
primarily use Cisco routers
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LSNDI RMRA5 4 Feb 2008
EIGRP
Offers multiprotocol operation (IP, IPX etc) EIGRP multiplies IGRP metric by 256 Uses 32-bit metric c.f. IGRP 24-bit metric Metric = bandwidth/ delay EIGRP BW = (107/ BW) x 256 EIGRP delay = (delay/10) x 256 Max hop = 224 c.f. IGRP 256
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LSNDI RMRA6 4 Feb 2008
EIGRP key features
EIGRP automatically shares routing information with IGRP and vice versa
EIGRP tags routes from other protocols as external Rapid convergence from Diffused Updating Algorithm
(DUAL) Guaranteed no loops – all routers running EIGRP update
at the same time if change occurs Efficient use of BW – partial incremental updates only Sent only to routers that need information – not all
routers
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LSNDI RMRA7 4 Feb 2008
Good use of Network Bandwidth
Partial bounded updates, unlike OSPF No timed routing updates RIP = 30s; IGRP = 90s – full routing tables EIGRP uses small hello packets Unreliable – no acknowledgements Supports VLSM & CIDR unlike IGRP Uses PDMs to support IP, IPX, Appletalk
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LSNDI RMRA8 4 Feb 2008
EIGRP Router Tables
Neighbour table lists adjacent routers One neighbour table per supported protocol Similar to OSPF adjacency database Holds neighbour address and interface data Hold time = time to wait before considering
neighbour to be ‘down’ = 3 x hello interval– Multicast to 224.0.0.10
Smooth Round Trip Timer SRTT
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LSNDI RMRA9 4 Feb 2008
Neighbour Table Contents
Queue Count (Q Cnt) = number of packets waiting in queue to be delivered
If Q Cnt > 0 means possible congestion problem Sequence number (Seq No) to keep track of
neighbour’s transmissions (not hellos) Supports reliable, sequenced delivery of packets
(like TCP) but using Reliable Transport Protocol (RTP)
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LSNDI RMRA10 4 Feb 2008
Neighbour Table
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LSNDI RMRA11 4 Feb 2008
Topology Table
Made up of all EIGRP routing tables in AS DUAL takes data from neighbour and topology
tables to calculate lowest cost routes Allows EIGRP to identify & switch to alternative
routes quickly Primary (successor) route placed in topology
table Also keeps a backup route if available
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LSNDI RMRA12 4 Feb 2008
In Topology Table are…
Feasible Distance (FD) – lowest calculated metric to each destination
Route Source – identifies number of router that identified the route originally
Reported distance (RD) – distance an adjacent router reports to a specific destination
FD RD (2195458/ 281400)
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LSNDI RMRA13 4 Feb 2008
Also in Topology table….
Interface information – identifies the router’s interface to reach a given destination
Route status – Passive (P) for a stable route Active (A) if DUAL is recalculating route Successor is primary route to destination Feasible successor is placed below successor as
a backup route to be used when topology changes (saves total recalculation of routing)
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LSNDI RMRA14 4 Feb 2008
Successor Routes
Appear in Topology and Routing table Can be up to 4 successor routes to a destination Can be of equal or unequal cost FS identified at same time as successors Only kept in Topology table Not mandatory to have FS If successor route goes down, lowest FS chosen
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LSNDI RMRA15 4 Feb 2008
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LSNDI RMRA16 4 Feb 2008
Identifying Routes
If no FS, router places Active status on a route Sends Query packets to all neighbours Neighbours reply with successor or no successor Passive status placed on route if positive reply DUAL always tries to identify a FS in case of
problems – saves querying neighbours and recalculations
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LSNDI RMRA17 4 Feb 2008
Neighbour Discovery and Rediscovery
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LSNDI RMRA18 4 Feb 2008
Reliable Transport Protocol
RTP guarantees ordered delivery of routing packets using sequence numbers
EIGRP is protocol independent – doesn’t need IP RTP used to multicast and unicast packets
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LSNDI RMRA19 4 Feb 2008
EIGRP Packet Types
Hello – sent on 1.544 Mbps or less every 60s Acknowledgement = data-less hello packet Update – sent to newly discovered neighbour Query – multicast or unicast Reply – response to a query
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LSNDI RMRA20 4 Feb 2008
Autonomous System Number
An Autonomous System (AS) is a set of networks and routers under the control of one body
This system has a common routing policy as presented to the Internet
ASs are given unique numbers between 1 and 65535
See RFC 1930
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LSNDI RMRA21 4 Feb 2008
Setting up EIGRP
Needs Autonomous System Number
Router(config)#router eigrp 123Router(config-router)#net 192.168.1.1 0.0.0.3Router(config-router)#net 22.22.22.0 0.0.0.255Router(config-router)#exit
Uses Wildcard Mask
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LSNDI RMRA22 4 Feb 2008
Verifying EIGRP
Router#show ip protocols This shows the routing protocol in use and other
useful information too
Router#sh ip eigrp ? interfaces IP-EIGRP interfaces neighbors IP-EIGRP neighbors topology IP-EIGRP Topology Table traffic IP-EIGRP Traffic Statistics
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LSNDI RMRA23 4 Feb 2008
Router#sh ip pro
Routing Protocol is "eigrp 123 " Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1 Redistributing: eigrp 123 Automatic network summarization is in effect Automatic address summarization: Maximum path: 4 Routing for Networks: 192.168.1.0/30 22.22.22.0/24 192.168.1.12/30 Routing Information Sources: Gateway Distance Last Update 192.168.1.1 90 864844 192.168.1.13 90 4096070 Distance: internal 90 external 170
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LSNDI RMRA24 4 Feb 2008
Debugging EIGRP
Router#debug eigrp ? fsm EIGRP Dual Finite State Machine events/actions
packets EIGRP packets
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LSNDI RMRA25 4 Feb 2008
Debug output
Router#debug eigrp paEIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, ACK )Router#EIGRP: Received HELLO on Serial0/0/0 nbr 192.168.1.2 AS 123, Flags 0x0, Seq 26/0 idbQ 0/0EIGRP: Received HELLO on Serial0/0/1 nbr 192.168.1.6 AS 123, Flags 0x0, Seq 20/0 idbQ 0/0EIGRP: Sending HELLO on FastEthernet0/0 AS 123, Flags 0x0, Seq 22/0 idbQ 0/0 iidbQ un/rely 0/0EIGRP: Sending HELLO on Serial0/0/1 AS 123, Flags 0x0, Seq 22/0 idbQ 0/0 iidbQ un/rely 0/0
Remember to turn of debugging when you have finished undebug all will turn off all debugging processes
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LSNDI RMRA26 4 Feb 2008
Summary
EIGRP similar to OSPF - – Has neighbour table– Sends hello packets
Has topology table (1 for each protocol) Uses DUAL on Neighbour & Topology tables Elects successors and feasible successors (FS) FS used in times of trouble – fast selection Verification and debug commands