CCIE R&S Advanced Technologies Class v4.5

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 06m
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 17m
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 02m

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

0:00:13	So, in our first section in OSPF,
0:00:19	the basic fundamentals of the protocol,
0:00:23	how do we deal with adjacencies
0:00:26	Then, we'll get into some more of the
0:00:30	the filtering authentication, and all o
0:00:35	Now, definitely, this would
0:00:39	the core topics within the routing
0:00:42	So, you really do need to be an expert on
0:00:47	Now, we'll see, some of these stuff is gonna
0:00:52	like how we deal with issues with
0:00:56	Not so stubby area, translator elections.
0:01:00	That type of stuff, you don't really
0:01:04	as long as you know what
0:01:06	and then what are the commands that
0:01:10	in order to work through
0:01:17	So, to start as a general overview of OSPF,
0:01:21	it is an open standards protocol.
0:01:23	If you look at RFC 2328,
0:01:26	that's gonna give you any of the real detailed
0:01:30	like what are the packet formats, how does
0:01:36	how does the path selection
0:01:38	So, we're not gonna get into that
0:01:43	but if you need to know that for some reason,
0:01:48	Also, the person that actually
0:01:54	who is John Moy.
0:01:57	There are a few books that he also wrote on...
0:02:02	OSPF
0:02:03	One is the OSPF implementation.
0:02:06	This is OSPF from a programmatic point of view.
0:02:09	So, this would be outside of our
0:02:12	you actually try to write an implementation of OSPF.
0:02:15	But there's also another book by him that is
0:02:21	So, this is the theory behind OSPF,
0:02:24	the problems that he was trying to solve
0:02:27	versus RIP or RIP Version 2 when writing a OSPF.
0:02:32	So, this gonna have a lot of the
0:02:36	similar to the RFC, because if we look at...
0:02:41	RFC 2328, which is OSPF Version 2,
0:02:46	you see that ths gentleman was
0:02:50	So, it's gonna be similar between the...
0:02:52	the two points of these. The RFC and the book
0:02:58	Other good resources for OSPF would be...
0:03:02	Routing TCP IP Volume 1.
0:03:05	There's a lot of good coverage in
0:03:11	There's another book that I don't
0:03:17	it is by Alex Zinin and...
0:03:23	It says, Cisco IP Routing.
0:03:27	This one here Packet Forwarding
0:03:31	This is a lot a good detailed information
0:03:40	A lot of good coverage of EIGRP and OSPF,
0:03:44	and the other protocols.
0:03:45	A lot of just basic logic about how
0:03:50	So if you've already gone through like the Jeff Doyle book,
0:03:56	this one definitely is a very good resource there.
0:03:58	Now, some of the attributes that we'll talk about...
0:04:01	within the scope of OSPF today.
0:04:03	Now, we know that it is a link state protocol
0:04:08	which is gonna have some effects on the
0:04:14	as we compare this to RIP or EIGRP.
0:04:17	We'll see that since OSPF forms active adjacencies,
0:04:24	there's some limitations as to the type
0:04:28	and the logic of a how we can
0:04:33	There's some things that are
0:04:35	based on how the RFC says the OSPF
0:04:40	and the path selection state machine works.
0:04:42	So, we do really need to
0:04:46	to get pass the really advanced
0:04:51	Now, since OSPF is classless, it does
0:04:55	There's no such thing as auto-summary
0:05:00	OSPF is always on the run as
0:05:05	We'll also see that it supports
0:05:09	and Network Layer Reachability
0:05:13	which are technically two separate topics,
0:05:17	where the NLRI summarization would be
0:05:23	where we're taking multiple subnets,
0:05:25	and then combining them
0:05:28	Like taking multiple /24 routes and
0:05:35	Now, the topology summarization
0:05:38	is gonna have to do with the logic of
0:05:43	different than inter-area and external lookups.
0:05:48	Now sometimes, OSPF is described as part
0:05:54	because the SPF algorithm is only to be
0:06:02	We'll see that when we get into
0:06:05	adding additional areas adding
0:06:09	the different types of stub areas,
0:06:10	there is a fundamental difference between how OSPF
0:06:14	does path selection on intra-area destinations
0:06:18	versus inter-area or external routes.
0:06:21	The basic configuration of OSPF
0:06:26	Similar to how was it EIGRP,
0:06:28	where our first up is that we need
0:06:33	Now, in OSPF, we do support multiple
0:06:38	These are going to be determined based
0:06:43	So, the process ID will be locally significant,
0:06:47	but when we actually configure,
0:06:48	either the network statement under the process,
0:06:54	we'll see that we could technically have multiple OSPF
0:07:01	Now, which interface is gonna
0:07:05	is gonna depend on where the
0:07:07	or at the interface level, what
0:07:13	So typically, for clarity, you would use the same
0:07:18	but technically, you don't have to.
0:07:20	As long as two routers are running
0:07:25	it doesn't matter what the process ID is,
0:07:27	because that number is not included in any of
0:07:35	Now, once we initialize the process,
0:07:37	we need to make sure that we have at
0:07:41	that is in the up and up state.
0:07:43	And this is the interface that is used
0:07:49	We'll see that by default,
0:07:51	the OSPF router ID will prefer to
0:07:55	but if there are no loopback
0:07:58	it'll take whatever the highest
0:08:02	So, whether this is a physical interface,
0:08:06	or whether it's a logical interface
0:08:09	we would always prefer the loopbacks
0:08:15	We'll also see, it is very important to make sure the
0:08:21	because this is what the routers use to identify
0:08:28	And if two or more routers are
0:08:32	we'll see that they will have problems trying
0:08:37	and then ultimately to run the SPF process.
0:08:40	So, once we define our global is a process,
0:08:43	then, we're gonna choose what interfaces
0:08:46	and what their area identifiers will be.
0:08:49	We'll see, with the OSPF areas, that's going
0:08:56	and also where SPF going to be run.
0:09:00	So, when we look at the details of actually
0:09:03	and how the lookups are run,
0:09:05	devices in area zero would not perform SPF
0:09:13	And likewise, devices in area 1,
0:09:16	their flooding domain is gonna be separate
0:09:23	Whether we issue the network
0:09:27	or the IP OSPF command at the interface level,
0:09:29	they're essentially going to have the same effect,
0:09:32	but the IP OSPF command,
0:09:34	the second one is probably
0:09:38	and little bit cleaner to read in the configuration,
0:09:41	because with the network
0:09:44	there can be some confusion as to which particular
0:09:52	Now, since in EIGRP, we don't have
0:09:57	We simply have links that the protocol is run on.
0:10:00	The network statement EIGRP is
0:10:05	because OSPF can have multiple network
0:10:11	When that process does occur,
0:10:14	whatever network statement that
0:10:17	towards an interface's IP address,
0:10:19	we'll ultimately determine what
0:10:24	Now, just like EIGRP, the network statement
0:10:29	It's simply used to match the address
0:10:34	So, whether we say in
0:10:39	that would mean that all interfaces
0:10:44	Then, our second statement, we're
0:10:48	saying that "Anything that
0:10:53	it is not gonna be in area zero. Anything
0:11:01	So, the zero in the wildcard mask is saying,
0:11:06	but I don't care what the other ones are."
0:11:09	Then likewise, our third statement here says
0:11:14	that'g gonna be in area 2.
0:11:16	Unless it starts with 1.2.3,
0:11:20	Then, if it is exactly 1.2.3.4,
0:11:26	So, you technically can do this configuration
0:11:29	to have multiple network statements
0:11:33	For clarity of the configuration, a lot of times,
0:11:39	It would be most accurate to
0:11:44	which says exactly this one
0:11:47	is gonna be inside aOSPF area zero,
0:11:50	or if we were to use the
0:11:55	we say IP OSPF for whatever the
0:11:58	Then, this link is in area zero.
0:12:01	We know that regardless of what
0:12:05	based on the interface level configuration,
0:12:12	Now, the only time that
0:12:15	between using the network statement
0:12:18	is that if the link were to be unnumbered,
0:12:23	or if it were to not have an address at all.
0:12:29	So, in the case of an unnumbered link,
0:12:33	let's say we have a serial interface that's
0:12:36	If the loopback has a network statement that
0:12:44	Then the loopback would be in area 4
0:12:46	plus any interfaces that are
0:12:51	Whereas with the link level command,
0:12:53	we would have to manually specify both on
0:12:58	what is the area that the other
0:13:03	But again, in the end it doesn't really
0:13:07	As long as what we do our basic verification,
0:13:10	and look at the...
0:13:13	Show IP OSPF Interfaces,
0:13:15	or Show IP OSPF Interface Brief,
0:13:18	that's gonna tell us what particular
0:13:25	Now, within this scope of the lab exam, unless
0:13:30	that says "Don't use the network statement
0:13:33	then, it's not really gonna matter
0:13:37	Really, the only limitation of them
0:13:39	is whether IOS version actually supports it.
0:13:43	So we'll see in a Catalyst-IOS, since running 12.2,
0:13:46	there's no support for the interface
0:13:51	whereas the routers are running 12.4T
0:13:55	Like EIGRP, we'll see that OSPF...
0:13:58	uses the hello protocol, and it uses its own transport
0:14:03	in order to discover neighbors in the topology.
0:14:06	We'll see that there's...
0:14:08	some more detailed differences between how
0:14:14	There's a lot of additional attributes
0:14:19	before they actually form an adjacency.
0:14:22	And the transport protocol number 89,
0:14:27	can use either two multicast addresses,
0:14:30	which are 224.0.0.5, and 224.0.0.6,
0:14:34	or the hellos could be unicast.
0:14:38	And we'll see, that's gonna be dependent
0:14:42	which is different depending on the
0:14:48	So we would see, with the default operation,
0:14:50	OSPF is gonna behave differently if
0:14:54	versus on Ethernet link, or a
0:15:00	So, from a Layer 2 design point of view,
0:15:03	we would need to take into
0:15:07	before we were choosing how to
0:15:11	or maybe how to configure Ethernet if
0:15:15	The underlying Layer 2 topology
0:15:19	in how OSPF is gonna perform
0:15:23	So, once the OSPF neighbors discover
0:15:28	they're going to exchange the attributes that
0:15:34	Now, neighbors that are adjacent
0:15:36	should then exchange the link state database,
0:15:40	which ultimately means that they can use
0:15:44	and come out with the Shortest
0:15:49	In certain cases, we'll see that not all
0:15:55	under normal design situations,
0:15:58	but also we have some sort of misconfiguration,
0:16:01	we could get to the point where
0:16:04	which ultimately means we cannot
0:16:07	and then cannot actually use
0:16:11	So, this stage in our OSPF configuration,
0:16:14	when we're establishing the adjacency,
0:16:16	this is where the vast majority of
0:16:21	So, if the routers do not agree on
0:16:25	and what their common attributes are gonna be,
0:16:31	then, they won't go pass the point of adjacency
0:16:38	Now, there's essentially only two unique
0:16:42	are true for the OSPF neighbors.
0:16:44	First would be that they have a unique router ID,
0:16:48	because this is the number that is going to
0:16:54	So, from a programmatic point of view,
0:16:57	the SPF algorithm builds a graph of the network,
0:17:00	where the routers are considered the nodes,
0:17:03	and the links are the vertices of a graph.
0:17:07	So essentially, the links that
0:17:13	In OSPF, we are using the router
0:17:19	So, if there are more than one node
0:17:23	then, the routers are not gonna understand
0:17:28	So typically, OSPF is using the logic that
0:17:32	we're gonna assume that you have
0:17:35	So, if I just choose any address
0:17:38	it ideally should be unique throughout
0:17:43	But in the case, we're doing some sort of
0:17:48	basic load-balancing, or any cast for multicast.
0:17:53	Then, we could potentially run into the case
0:17:57	Then, it would ultimately cause those connected
0:18:03	or if the devices with the duplicate
0:18:07	they would not be able to flood LSA's to each other.
0:18:12	So, it's a pretty simple check here. Once we enable
0:18:17	it's gonna tell us what the local router ID is.
0:18:20	If this happens to not be a unique value,
0:18:23	then, we can simply changed it. We can go into the
0:18:29	Whatever value that we wanna define.
0:18:33	The next unique attribute we would have is
0:18:38	So, it doesn't make sense that two routers on the
0:18:45	from a normal routing design point of view.
0:18:48	So, if there's routers on an Ethernet segment,
0:18:57	Now, the common attributes would
0:19:01	which again is going to define what
0:19:07	So, all routers in area zero are
0:19:11	We have a hello interval and the dead interval,
0:19:13	which are to be the timers that determine
0:19:17	and then, how long are we gonna wait
0:19:22	Again this is the opposite of how EIGRP
0:19:29	where the hold time and EIGRP
0:19:33	how long they should wait before
0:19:39	In the case of OSPF, the hello interval and
0:19:44	saying that "This is how
0:19:47	And this is how often I'm going to wait before
0:19:53	So, if there's a mismatch, either between
0:19:57	the routers will not able to form an adjacency.
0:20:01	Next, we have the interface's network address,
0:20:05	which is basically the subnet.
0:20:07	So, the routers would not be able to be
0:20:11	We could potentially see some problems
0:20:15	like for PPP,
0:20:17	or doing some sort of PPP IP CP negotation.
0:20:21	So normally, the OSPF routers would need to be
0:20:28	Next, we have the interfaces MTU,
0:20:32	which is a protection against
0:20:36	in which case the OSPF neighbors would not actually
0:20:43	So, if my interface MTU is a hundred bytes,
0:20:49	when you send a packet at a thousand,
0:20:51	I'm not gonna be able to receive
0:20:56	So typically, all the devices on the physical
0:21:02	We'll see some kind of corner
0:21:05	there are valid cases where the
0:21:10	And we'll have to go through some different
0:21:18	Next, we have the OSPF network type
0:21:21	that is going to control how OSPF
0:21:26	how the next hop value is calculated,
0:21:30	and also what particular LSA's
0:21:34	to do an actual calculation of a graph of the network.
0:21:38	Now, the network type technically does not
0:21:44	We'll see that it just has to be a compatible value.
0:21:48	Under normal circumstances, you would
0:21:51	but it technically doesn't have to.
0:21:54	So, this means that devices that are
0:21:57	would be able to be adjacent with
0:22:02	Or devices running point-to-point could be
0:22:06	but usually there's not any reason
0:22:12	Next, we have the authentication,
0:22:14	where obviously, if I have a different password than
0:22:19	We'll see that OSPF supports three
0:22:23	which are null, clear text and MD-5.
0:22:27	So by default, technically, OSPF does
0:22:31	It just does null authentication, or type
0:22:37	So, if I'm doing clear text authentication,
0:22:41	then, were not gonna be able
0:22:48	Next, we have the stub flags,
0:22:51	which controls what particular
0:22:55	the router will accept in the
0:23:00	So, this means that if we have area 1
0:23:04	all the routers in area 1 need
0:23:09	Likewise would be the same case
0:23:11	So, everyone in the NSSA
0:23:15	that this area is NSSA,
0:23:17	which is gonna change the behavior
0:23:24	Then lastly, we have some
0:23:28	Typically, these would be what is exchanged
0:23:34	in OSPF, where Opaque LSA is used
0:23:41	A good example of this would be
0:23:45	So if one device support traffic
0:23:49	then, they wouldn't be
0:23:52	Now, MPLS TE is gonna be
0:23:56	We will talk about later three MPLS VPNs,
0:23:59	but we're not to get into the details of traffic
0:24:05	So from our point of view, really, the only
0:24:09	is the nonstop forwarding capability of OSPF,
0:24:13	which is also called the "Graceful Restart".
0:24:17	So, it's an ability of one OSPF router
0:24:22	that the control plane is gonna
0:24:26	typically when we're doing some
0:24:30	or route processor redundancy
0:24:38	So, if one of the router supports the
0:24:42	then, it has to signal the other ones
0:24:46	So, once we establish the OSPF process,
0:24:50	we put either the network
0:24:52	or the IP OSPF command at the interface level,
0:24:55	then, we wanna go through a basic
0:24:59	is OSPF actually enabled on
0:25:02	and is it using the correct area identifiers?
0:25:06	We can see this witht the Show
0:25:11	or Show IP OSPF Interface Brief.
0:25:13	Okay, where the last one, Show IP OSPF Interface
0:25:19	to make sure that the router
0:25:21	it has OSPF enabled on the interfaces,
0:25:24	and they're running the correct area IDs.
0:25:28	Once we know the process is actually running,
0:25:31	then, we should establish the
0:25:35	So, if we Show IP OSPF Neighbor,
0:25:37	and we see that there's some problem between
0:25:42	we can look at the Debug IP
0:25:46	That's gonna show us the actual hello exchange
0:25:49	and if there's any variable that
0:25:52	So, maybe the MTU value, or the
0:25:57	We'll see different types of error messages
0:26:04	Then lastly, once adjacency is established,
0:26:07	the link state database should exchange.
0:26:09	And we should be able to see the calculation of
0:26:14	or look at the detail of an individual LSA type.
0:26:19	So today, we're gonna spend a bunch of time
0:26:23	looking at how do we read the difference
0:26:28	versus the network LSA originated by the DR,
0:26:32	or the summary LSA's that are coming
0:26:38	So, the database from any
0:26:42	we should see that we will be able to predict how
0:26:49	because devices in the same area should
0:26:54	So, let's take a look at a basic
0:26:56	OSPF configuration here, if we look at our...
0:27:00	topology to that we were using before.
0:27:03	Right now, I have the basic
0:27:07	And on all the devices on
0:27:10	I have been configured to
0:27:14	So, where in the previous example I have
0:27:20	but in this example everyone is using
0:27:25	Which then is going to imply...
0:27:28	that we would either need to use inverse ARP
0:27:30	in order to resolve our Layer 3 IP
0:27:35	or we would have to use the

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CCIE R&S Advanced Technologies Class v4.5
Title:	CCIE R&S Advanced Technologies Class v4.5
Duration:	81h 02m
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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