CCIE Routing & Switching Advanced Technologies Class

Transcript

1	Introduction	0h 43m
2	Using the Cisco Documentation	0h 52m
3	Ethernet Overview, Layer 2 Switchports, Trunking, ISL, 802.1q, DTP	0h 47m
4	VTP, VTP Authentication, VTP Pruning	1h 02m
5	VTP Prune Eligible List, VTP Transparent, VTP Troubleshooting, Trunk Allowed List, Extended VLANs	0h 48m
6	VLAN and VTP Review	0h 19m
7	SVIs, Native Routed Interfaces, Router-on-a-Stick	0h 46m
8	Layer 2 EtherChannel, EtherChannel Load Balancing, Layer 3 EtherChannel	0h 57m
9	802.1q Tunneling, Layer 2 Protocol Tunneling, EtherChannel over 802.1q Tunneling	1h 03m
10	STP Root Bridge Election, STP Root Port Election, STP Designated Port Election, STP Priority, STP Cost, STP Port-Priority	1h 46m
11	STP Review	0h 12m
12	STP Timers, STP PortFast	0h 34m
13	STP UplinkFast	0h 11m
14	STP BackboneFast	0h 12m
15	STP BPDU Filter	0h 13m
16	STP BPDU Guard	0h 11m
17	STP Root Guard	0h 11m
18	STP Loop Guard, Unidirectional Link Detection (UDLD)	0h 11m
19	Multiple Spanning-Tree Protocol (MST)	0h 40m
20	Rapid Spanning-Tree Protocol (RSTP), Rapid-PVST	0h 18m
21	MST with Multiple Regions	0h 33m
22	Flex Links	0h 16m
23	Frame Relay	0h 39m
24	Frame Relay Configuration Part 1	0h 34m
25	Frame Relay Configuration Part 2	0h 41m
26	Frame Relay Switching	0h 27m
27	Back-to-Back Frame Relay	0h 08m
28	Frame-Relay End-to-End Keepalives	0h 18m
29	PPP, PPP PAP Authentication, PPP CHAP Authentication	0h 59m
30	PPPoFR, PPPoE	0h 40m
31	Transparent Bridging, IRB	0h 32m
32	Fallback Bridging	0h 14m
33	IP Routing Overview, Switching Paths, Static Routing	0h 42m
34	Static Routing Examples	0h 25m
35	IP Default-Gateway, IP Default-Network	0h 14m
36	On-Demand Routing (ODR)	0h 07m
37	Floating Static Routes	0h 10m
38	Backup Interface	0h 29m
39	Enhanced Object Tracking, IP SLA, Reliable Static Routing	0h 21m
40	Policy Routing	0h 43m
41	GRE Tunneling, GRE Recursive Routing Errors	0h 27m
42	Reliable Backup Interface with GRE	0h 25m
43	RIP Overview, RIP Versions, RIP Auto-Summary	0h 48m
44	RIP Split-Horizon, RIP Timers	0h 22m
45	RIP Broadcast Updates, IP Directed Broadcast, IP Broadcast-Address, Smurf Attacks, Fraggle Attacks	0h 16m
46	RIP Unicast Updates	0h 03m
47	RIP Offset-List	0h 18m
48	RIP Authentication	0h 11m
49	RIP Summarization	0h 10m
50	Prefix-Lists, RIP Distribute-List Filtering, RIP Administrative Distance Filtering	0h 48m
51	RIP Default Routing, RIP Conditional Default Routing	0h 18m
52	RIP Triggered, RIP Validate Update Source,	0h 12m
53	EIGRP Overview	0h 29m
54	EIGRP Auto-Summary	0h 07m
55	EIGRP Split-Horizon	0h 11m
56	EIGRP Update Types, EIGRP Neighbor, EIGRP Passive-Interface	0h 24m
57	EIGRP Hello-Interval, EIGRP Hold-Time	0h 05m
58	EIGRP Authentication	0h 11m
59	EIGRP Time Based Authentication	0h 25m
60	EIGRP Path Selection, EIGRP Metric Weights, EIGRP Traffic Engineering	0h 47m
61	EIGRP Unequal Cost Load Balancing, EIGRP Variance	0h 19m
62	EIGRP QUERY, EIGRP Summarization, EIGRP Leak-Map	0h 28m
63	EIGRP Stub Router Advertisement	0h 22m
64	EIGRP Default Routing	0h 13m
65	EIGRP Route Filtering	0h 11m
66	EIGRP Router-ID	0h 07m
67	Miscellaneous EIGRP Features	0h 02m
68	OSPF Overview	0h 27m
69	Establishing OSPF Adjacencies, Understanding the OSPF Database	0h 43m
70	OSPF Network Type Broadcast, OSPF DR/BDR Election, OSPF over NBMA, OSPF Network Type Non-Broadcast and Point-to-Multipoint	0h 56m
71	OSPF Network Type Point-to-Point, OSPF Network Type Mismatch	0h 13m
72	OSPF Network Type Point-to-Multipoint Non-Broadcast, OSPF Per Neighbor Cost	0h 17m
73	OSPF Network Type Loopback	0h 02m
74	OSPF Path Selection	0h 27m
75	OSPF Convergence Timers	0h 09m
76	OSPF Authentication	0h 12m
77	OSPF Summarization	0h 32m
78	OSPF Stub Areas, OSPF Totally Stubby Areas, OSPF NSSAs, OSPF Totally NSSAs	0h 40m
79	Controlling OSPF NSSA Redistribution	0h 02m
80	OSPF Type 7 to 5 Translator Election, OSPF LSA Type 3 Filter, OSPF Forwarding Address Suppression	0h 24m
81	Route Redistribution Overview	0h 36m
82	Route Redistribution Configuration & Verification, Connected Redistribution	0h 22m
83	OSPF External Path Selection, TCL PING Scripting	0h 33m
84	Routing Loops Overview, EIGRP Route Loop Prevention	0h 55m
85	Metric Based Routing Loops, Route Tagging	0h 46m
86	Administrative Distance Based Routing Loops, Debug IP Routing, IP Route Profile	0h 58m
87	BGP Overview, BGP Peering Types	0h 51m
88	Establishing BGP Peerings, EBGP Multihop, BGP Neighbor Disable Connected Check, BGP TTL Security	0h 49m
89	BGP 4-Byte ASNs	0h 20m
90	BGP Local AS, BGP Peer Groups	0h 30m
91	BGP Next-Hop Self, BGP Next-Hop Processing	0h 30m
92	BGP Route Reflectors	0h 37m
93	Large Scale BGP Route Reflectors with Clusters	0h 34m
94	BGP Confederation	0h 37m
95	BGP NLRI Advertisements, BGP Network Statement, BGP Redistribution	0h 43m
96	BGP Aggregation, BGP Aggregation & Summary-Only, BGP Aggregation & Unsuppress-Map	0h 46m
97	BGP Origin, BGP Aggregation & AS-Set, BGP Aggregation & Advertise-Map	0h 22m
98	BGP Conditional Route Injection	0h 21m
99	BGP Bestpath Selection, BGP Multipath, BGP Weight	0h 53m
100	BGP Local Preference, BGP Local Preference and Communities, BGP AS-Path Prepending,	0h 30m
101	BGP MED, BGP MED Missing As Worst, BGP Deterministic MED	0h 34m
102	BGP Communites, BGP Regular Expressions	0h 43m
103	BGP Filtering, BGP Convergence Timers, BGP Default Routing, Miscellaneous BGP Features	0h 24m
104	MPLS Overview, MPLS Label Distribution Protocol (LDP)	1h 05m
105	MPLS Tunnels, MPLS Penultimate Hop Popping (PHP)	0h 40m
106	MPLS Layer 3 VPNs Overview, VRF Lite	0h 36m
107	MPLS Layer 3 VPNs and VPNv4 BGP	1h 08m
108	MPLS Layer 3 VPN Verification & Troubleshooting	0h 49m
109	MPLS Layer 3 VPN OSPF PE-CE Routing Overview	0h 06m
110	MPLS Layer 3 VPN OSPF PE-CE Routing Path Selection & Sham-Links	2h 01m
111	MPLS Layer 3 VPN OSPF PE-CE Routing Loop Prevention & Down-Bit, OSPF Capability VRF-Lite	0h 40m
112	IPv6 Overview, IPv6 ICMPv6 ND, IPv6 over NBMA	0h 44m
113	IPv6 Routing Overview, IPv6 Static Routing	0h 28m
114	IPv6 RIPng	0h 20m
115	IPv6 EIGRPv6	0h 09m
116	IPv6 OSPFv3	0h 31m
117	MP-BGP for IPv6	0h 26m
118	IPv6 Tunneling	1h 13m
119	Multicast Overview, IGMP	0h 34m
120	PIM Overview	0h 18m
121	PIM Dense Mode	1h 03m
122	PIM Sparse Mode	0h 30m
123	PIM Sparse Mode Configuration	0h 36m
124	PIM Sparse Mode RPF & RP Troubleshooting	0h 27m
125	Auto-RP, Multicast over GRE Tunnels	0h 53m
126	Bootstrap Router (BSR), Bidirectional PIM, Source Specific Multicast (SSM)	0h 40m
127	MSDP, Anycast RP	0h 27m
128	IPv6 Multicast Routing	0h 24m
129	QoS Overview, IntServ QoS, DiffServ QoS, IP Precedence, DSCP, MQC, HQF	0h 41m
130	MQC Classification	0h 44m
131	FIFO, FQ, WFQ, CBWFQ, HQF	0h 50m
132	LLQ	0h 23m
133	WRED	0h 31m
134	Traffic Shaping, Traffic Policing	0h 40m
135	Frame Relay Traffic Shaping (FRTS)	0h 33m
136	RSVP	0h 07m
137	Catalyst 3560 QoS	1h 00m
138	IOS Security Overview, Access Lists (ACLs)	0h 58m
139	Time Based ACLs, Dynamic ACLs	0h 33m
140	Reflexive ACLs	0h 21m
141	TCP Intercept, Content Based Access Control (CBAC)	0h 34m
142	Zone Based Policy Firewall (ZBPF)	1h 09m
143	AAA, Local Authentication, Local Authorization, Role Based CLI Access	0h 43m
144	Port Security, Static CAM Entries, Storm Control, 802.1X Authentication, PACLs, RACLs, VLAN Access Maps (VACLs)	0h 48m
145	DHCP Snooping, Dynamic ARP Inspection (DAI), IP Source Guard	0h 12m
146	Protected Ports, Private VLANs	0h 25m
147	IP Services Overview, HSRP	1h 10m
148	VRRP, GLBP	0h 28m
149	NAT	0h 42m
150	DHCP, DNS	0h 30m
151	NetFlow	0h 09m
152	WCCP, Miscellaneous IP Services	0h 06m
153	System Management Overview, NTP, NTP Authentication	0h 24m
154	SNMP, RMON	0h 38m
155	Syslog, Telnet, SSH, Banners	0h 21m
156	EEM Scripting, Miscellaneous System Management	0h 26m
Total Duration		81h 59m

Slides - Diagrams

Slides - Introduction

Slides - Ethernet Switching

Slides - Advanced Ethernet Switching

Slides - Frame Relay

Slides - PPP

Slides - Transport Bridging

Slides - Redistribution

Slides - IOS Security

Slides - Layer 2 Security

Slides - IP Services

Slides - System Management

0:00:14	In our next section here, we're gonna
0:00:19	which we'll see it has more features and
0:00:22	some more design understanding that
0:00:27	But it's still not gonna be as complicated as
0:00:29	the OSPF or BGP features and design issues that
0:00:38	So, we'll see when we look at both
0:00:44	as compared to OSPF and BGP, there's
0:00:49	test out before getting into the exam.
0:00:51	But just like RIP, you're pretty much
0:00:56	in the routing and switching lab exam.
0:00:58	So, there's no reason to go to the exam without making
0:01:05	Now, as we know, EIGRP is considered a
0:01:10	because it has some properties of link state protocols
0:01:16	So, as a link state property,
0:01:21	But as distance vector, it still uses things
0:01:26	Now, we'll see that the diffusing update
0:01:32	But technically, the protocol
0:01:35	because we don't have an overall view
0:01:41	So, just like RIP, EIGRP is considered
0:01:46	Which means it only knows what is directly
0:01:51	Now, based on the feasibility condition
0:01:55	we'll see that EIGRP is
0:01:59	and it's highly, highly unlikely that a
0:02:03	But technically, it is still considered
0:02:08	Now, EIGRP like OSPF, does use
0:02:14	which is IP protocol number 88,
0:02:20	So, this means that when we are establishing
0:02:26	we need to make sure that protocol
0:02:31	This will be both for
0:02:35	By deafult, EIGRP uses multicasts to establish
0:02:42	But beyond that, most of the
0:02:46	in order to actually synchronize the topology.
0:02:50	Once the network is fully converged,
0:02:56	but unicast are still used for things
0:02:58	and the query reply messages when
0:03:05	So, if we were to configure an
0:03:11	we would need to take into account both
0:03:16	and the unicast addresses
0:03:21	Now, typically, when we're
0:03:24	if we want to permit it when
0:03:27	maybe the content-based access
0:03:33	The easiest way would just be to
0:03:38	So, if we said, Access List
0:03:43	or Permit 88 from this particular
0:03:46	that 88 is referncing the
0:03:51	When we actually looked at this
0:03:53	the shortcut keyword EIGRP is
0:03:59	Likewise, if we were to say,
0:04:02	it's talking about protocol number 89.
0:04:08	Now, the actual configuration of
0:04:12	when we compare it to OSPF or BGP.
0:04:15	Where we simply enable
0:04:18	and specify what interfaces we
0:04:24	Now, EIGRP can run multiple
0:04:29	which means that the autonomous system
0:04:33	Or as an OSPF, the process ID is only
0:04:39	And EIGRP, the AS number is
0:04:44	So, everyone has to agree on the
0:04:48	and in order to exchange the updates.
0:04:52	Now, the network statement in EIGRP is a little bit more
0:04:59	Because we can control with
0:05:02	exactly what interfaces the
0:05:07	based on the IP address of the link.
0:05:09	So, we'll see, this is similar to to how a
0:05:14	Part of the confusion of this though,
0:05:16	is that the IOS parcer has some error
0:05:22	that if you enter wildcard
0:05:25	as opposed to a wildcard mask,
0:05:27	the parceer will automatically convert
0:05:32	So, if I have an address on the link,
0:05:35	let's say for example that
0:05:39	for the Fast Ethernet 0/1,
0:05:42	we have 155.10.5.0/24,
0:05:47	If I put a network statement under EIGRP,
0:05:51	that says, Network 150.10.5.0 255.255.255.0,
0:05:57	the parcer will take that command,
0:05:59	but then coinvert the subnet
0:06:04	The most accurate way to
0:06:08	would be to match on the
0:06:12	where we would say,
0:06:26	This essentially means that
0:06:29	on any interface that has the
0:06:36	We don't care what the subnet mask is,
0:06:39	we don't care if this is an address that
0:06:42	like in an unnumbered situation.
0:06:45	When we look at the Show IP Interface Brief,
0:06:48	any interface that matches this address
0:06:55	So, part of the confusion here
0:06:57	is that it does not relate to
0:07:02	So, I'm saying, "0.0.0.0" in the wildcard mask,
0:07:04	it does not mean that
0:07:08	It simply means that this interface
0:07:13	Now, we'll see in some
0:07:17	like OSPFv3 and EIGRPv6 for IPv6 routing,
0:07:21	they removed this confusion
0:07:25	by moving the enabling of the process
0:07:30	So, whereas we say, IPv6 Router
0:07:36	to enable the EIGRPv6 process.
0:07:39	Because the network statement can be confusing
0:07:43	It just controls what links
0:07:51	So, once we enable the protocol,
0:07:53	if we look at the Show IP EIGRP Interfaces,
0:07:58	or Show IP Protocols,
0:08:00	that's gonna tell us what particular local
0:08:05	If we look at Show IP
0:08:07	it's gonna show things
0:08:11	What are the adjacencies that we have
0:08:14	and other attributes on a per-link basis
0:08:19	Now, for some reason, we find that there's
0:08:24	That we cannot get a basic
0:08:27	The output we wanna look
0:08:31	Not any output that says Debug IP EIGRP.
0:08:36	The reason why is that although
0:08:41	it was originally written to route
0:08:46	It was able to route IPv4,
0:08:51	So, the Debug EIGRP is referring
0:08:57	where Debug IP EIGRP would be
0:09:02	But the establishment of the
0:09:06	It would be shown as the
0:09:09	Debug EIGRP Packet Acknowledgement,
0:09:12	that's gonna show us what happens
0:09:17	This would also tell us...
0:09:19	if there were any mismatches
0:09:22	like the authentication or the metric waiting
0:09:28	Debug EIGRP Packet is gonna
0:09:35	Next thing we would verify is the
0:09:39	If we look at the Show IP EIRGP Neighbors
0:09:43	the key output here we're looking for
0:09:46	is that the update queue count is zero.
0:09:51	The queue count indicates how many
0:09:55	in order to be sent to
0:09:59	So, in other words, if we see this
0:10:02	it means that the routers are currently
0:10:07	And if the number continues
0:10:10	it means that there's something wrong
0:10:14	Normally, the actual update process,
0:10:19	should be very, very fast.
0:10:22	If we see that it is a non-zero value,
0:10:26	we could potentially have
0:10:28	or maybe one router is able to
0:10:33	but the other neighbor is not.
0:10:35	Like maybe over a frame-relay
0:10:38	if we don't have the proper
0:10:41	or maybe some sort of Layer 2 Ethernet where
0:10:47	Like a VLAN access list or an access
0:10:51	that might be potentially dropping
0:10:58	Once we verify that the
0:11:01	we can look at the actual routing
0:11:05	by looking at the Show IP EIGRP
0:11:13	Now, in EIGRP, we'll see...
0:11:16	that similar to BGP,
0:11:18	we only advertise the pass
0:11:24	So, unlike OSPF that advertises
0:11:29	EIGRP will only advertise the ones that are
0:11:35	This means that in some designs,
0:11:37	if there is a reason that a route is in
0:11:43	it means that, that particular
0:11:47	And that is also the same case for RIP.
0:11:50	We'll see that when we get into redistribution
0:11:55	For EIGRP and RIP, if the route
0:12:00	it means that we cannot advertise it.
0:12:03	We'll see this when we look
0:12:06	If it says that "The feasible distance
0:12:12	It means that for some reason, that is not
0:12:16	which then ultimately means
0:12:26	So, in our topology, our first step...
0:12:29	is that we're going to enable the process.
0:12:31	And we'll do it just on every interface
0:12:35	with the same autonomous system
0:12:39	So, in a similar configuration to RIP,
0:12:41	I'm simply gonna send all of the router EIGRP
0:12:49	So, on the access server,
0:12:53	Send Star (*) to go on all the lines.
0:12:56	We'll tell the routers to go to global config.
0:12:59	I wanna make sure that all the
0:13:03	We'll run the EIGRP process.
0:13:07	And then...
0:13:09	specify that any interface that starts with 155.10
0:13:15	we'll run EIGRP along with the loopback
0:13:26	Now, I could have also said Network 0.0.0.0
0:13:34	that would mean that any interfaces
0:13:38	that the EIGRP process would be enabled.
0:13:42	So, it really just depends how granular do
0:13:47	In a production network, you want
0:13:49	So, you don't want someone changing
0:13:55	And then, enabling them into the process unless
0:14:01	Now, within the scope of the lab exam, it really
0:14:05	So, if they don't care how you
0:14:09	The network statement that is exact
0:14:12	Or one that is vague that
0:14:16	The only problem with
0:14:20	Network 0.0.0.0 255.255.255.255 is that if I
0:14:31	let's say that a loopback for
0:14:35	it means that it's automatically gonna
0:14:41	And based on the individual design in the exam,
0:14:47	So, you technically can do this. I would
0:14:50	I would do the more specific
0:14:55	either that are based on the mask of
0:15:02	Now, in any case, as long as we look
0:15:07	and this shows the correct links
0:15:10	that's really the ultimate goal.
0:15:14	So, regardless of the syntax
0:15:16	this is really what we care about. So, is EIGRP
0:15:22	We can also see from this output.
0:15:25	It says, "The number of peers that
0:15:31	So, if the interface is a transit link
0:15:35	that it says that there are zero peers,
0:15:37	it would mean there's something wrong
0:15:42	On router 1's Fast Ethernet 0/0,
0:15:45	it says that there are two peers,
0:15:48	which in this case are the adjacency
0:15:56	and from 1 to 6.
0:15:58	So, this is what we would
0:16:01	Whereas with the serial 0/0.1, that's the
0:16:07	That's talking about router 5.
0:16:10	Then, the other point-to-point link going
0:16:15	So, simply based on the
0:16:19	it's already giving me a good amount of information
0:16:23	So, the adjacencies between router 1 and these
0:16:32	Now, if we look at the Show
0:16:36	it's gonna give me some more
0:16:40	state of the interface like,
0:16:45	It says that the authentication mode is not set.
0:16:48	So, we're not running MD-5 authentication.
0:16:51	It says that we can use multicast on this link.
0:16:57	So, depending on the underlying media,
0:17:01	it's gonna choose whether we want
0:17:05	For the LAN interface, we should be using multicast,
0:17:11	We see, for the point-to-point serial link,
0:17:14	because we're assuming that there's
0:17:20	Now, there is no EIRGP network
0:17:26	The process itself should automatically
0:17:31	But the key point being is that by default, we need
0:17:36	in order for the adjacencies to establish.
0:17:40	If we filtered out the unicast, we would
0:17:44	but the topology does
0:17:47	So, we would not be able to install
0:17:56	Next thing, we would wanna look
0:18:01	So, from this output, it tells us
0:18:05	what are the interfaces
0:18:09	What's the hold time that is left whether
0:18:15	Then, most importantly,
0:18:20	So here, if the queue count is zero,
0:18:23	then, it means that these
0:18:28	Usually, the only case that you
0:18:32	Is that you coincidentally looked at
0:18:36	while they're actually doing
0:18:39	or more likely that there's some problem
0:18:44	Like if the unicasts are filtered out or
0:18:49	or maybe there's a K value mismatch,
0:18:52	anything where the queue count
0:18:56	means that the routers are not
0:19:07	Next, if we were to look at
0:19:12	these are the different packet
0:19:16	For the adjacency, we may wanna look at
0:19:21	If I just say, Debug EIGRP Packets,
0:19:26	So, we see that we're sending hellos,
0:19:31	This is a good basic verification to make sure that
0:19:38	So, if I'm sending hellos out the link,
0:19:43	then that potentially could be a problem.
0:19:49	Once the adjacencies are established,
0:19:51	then, we should exchange
0:19:54	and run the dual calculation to actually figure
0:19:59	If we look at the Show IP
0:20:04	this is gonna show us all
0:20:07	Or not the currrent links, the current routes
0:20:14	Now, it doesn't necessarily mean that all
0:20:20	because normally, only the prefix that
0:20:26	which essentially is the
0:20:30	is gonna get installed into the routing table.
0:20:34	So, from router 1's perspective,
0:20:38	the link between router 3 and switch 1,
0:20:43	it says, "I have two possible routes to get there.
0:20:48	If I go to router 6, my
0:20:52	If I go to router 3, my total
0:20:57	So, I'm obviousluy going to prefer
0:21:02	So, that means that's what
0:21:06	So, the calculation itself is
0:21:10	You simply just look at what are all the
0:21:14	and pick the one that
0:21:17	Okay, it's only when we really
0:21:19	doing the backup paths with
0:21:22	Then, trying to do any path
0:21:27	values that make up the composite metric,
0:21:30	then, it starts to get kind of complicated
0:21:34	But under most circumstances,
0:21:38	and EIGRP is gonna take care of itself.
0:21:45	Now, the other output that we might wanna see
0:21:53	which will show us also the
0:21:59	Now, these are the ones that could
0:22:06	that we are normally
0:22:10	because we cannot guarantee
0:22:13	that the traffic is not
0:22:16	So, if we're to look at that...
0:22:20	37 route for example.
0:22:24	37 actually only has two paths still.
0:22:31	previously had only...
0:22:37	a few paths. Let's see, the 23.
0:22:47	Okay, the 23, when we look at the Show
0:22:51	155.10.23.0/24.
0:22:58	Notice that this says that
0:23:02	Okay, the total metric for
0:23:07	If we look at the Show IP
0:23:16	it says, "In reality, there's two
0:23:21	but one of them is not valid, because we
0:23:28	Now, the way that we do this
0:23:34	that the values EIGRP uses for it
0:23:40	Okay, the basic logic is that
0:23:45	what metric are you advertising
0:23:50	and what is my metric to reach you?
0:23:52	I'm gonna take what you're advertising
0:23:57	Add those two together, that's
0:24:02	If I see some other neighbor that is
0:24:07	that the value they're advertising to me
0:24:16	It means that they have to be a loop-free path,
0:24:23	So if we look at this visually,
0:24:26	let's say for example that router 1
0:24:28	has two possible neighbors
0:24:34	Now, beyond this, router 1 has no visibility of
0:24:40	because in EIRGP, it doesn't
0:24:43	It only knows about what the directly
0:24:47	So, router 2 says...
0:24:50	that my metric to get
0:24:55	Now, maybe router 1's metric
0:25:01	So, the total cost in this path is 30.
0:25:05	Router 3 is advertising a cost of 5,
0:25:10	but my link to get to router 3 is a
0:25:16	Now, we obviously know
0:25:19	so we would try to prefer
0:25:22	that's gonna have
0:25:26	But now, when we compare the value
0:25:31	versus what router 3 is advertising.
0:25:38	Since our metric is greater than
0:25:43	there is no possible way that
0:25:50	Because if it were, then, their
0:25:56	So, based on the simple logic that EIGRP says that
0:26:03	you're actually closer to
0:26:06	And this is what we call the
0:26:10	So, we'll see when we actually get
0:26:14	this is how EIGRP can get
0:26:17	by having pre-calculated loop-free
0:26:24	So, in this potential case, if router 1
0:26:29	it would immediately start
0:26:32	without having to do
0:26:35	And the reason why is that it knows that router 3
0:26:48	Now, when we look at this
0:26:51	the values that we would wanna look at...
0:26:54	Are the first number in the
0:27:01	Now, the first one is the total metric that
0:27:08	So, it is whatever metric that they are
0:27:14	What the router does first is
0:27:18	The first one in the parentheses
0:27:22	Now, in this case, we see that
0:27:26	is lower than the 21 million that's
0:27:32	So, it means that this top value wins.
0:27:36	So feasible distance, that's simply the metric.
0:27:39	The next thing we do is look at what are
0:27:47	That's what the second value is.
0:27:49	So, router 3 is telling router 1 that its metric
0:28:01	Now, since 20 million is still higher
0:28:07	I cannot guarantee that router 3 is
0:28:13	So, this second path is then
0:28:17	which is why when we look at the
0:28:21	only the first value is showing up.
0:28:28	So again, if you wanna see what are all
0:28:31	not only the ones that
0:28:35	that's what Show IP EIGRP Topology
0:28:43	Then, if we wanna see what are the specifics
0:28:48	If we were to say Show IP EIGRP
0:28:57	this shows us all the possible
0:29:01	Plus all of the individual attributes
0:29:05	So, things like the minimum
0:29:07	the delay, the total reliability, the total load,
0:29:15	Now, we see, not all of these values are
0:29:20	It depends on how the routers
0:29:25	that go into the actual calculation formula.
0:29:28	And actually, by default, only
0:29:32	which is the minimum
0:29:36	These other ones, the reliability,
0:29:38	these are not used as part of the metric calculation.
0:29:42	Now, we'll see, the reliability, and the load technically,
0:29:48	but it is not by default.
0:29:51	The MTU and the hop count, those are
0:29:56	MTU is used as a tie breaker,
0:29:57	where hop count is just to make
0:30:03	Because just like RIP, EIRGP technically
0:30:08	because it is a distance vector protocol.
0:30:12	information about what the

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CCIE Routing & Switching Advanced Technologies Class
Title:	CCIE Routing & Switching Advanced Technologies Class
Duration:	81h 59m
The CCIE Routing & Switching Advanced Technologies Class is the first step in understanding CCIE level technologies and is a companion to the Advanced Technologies Lab Workbook. Each technology you need to know for the CCIE Routing & Switching lab will be described in detail using an instructor led hands on demonstration. The class consists of over 80 hours of in depth explanations and examples.
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EIGRP Overview

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