CCIE Routing & Switching Advanced Technologies Class - Route Redistribution Configuration & Verification, Connected Redistribution

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

0:00:13	In our next section here, we're gonna look at an example topology that I have set-up
0:00:17	with three different IGPs.
0:00:19	Where router 4 is running RIP OSPF and EIGRP.
0:00:24	And we want to get reachability from the EIGRP domain to both OSPF and RIP domains
0:00:30	and from the OSPF domain to RIP domain.
0:00:35	So, first, we look at what happens under the normal case of redistribution.
0:00:39	What we should expect to see in the RIP database versus the OSPF and the EIGRP topology
0:00:45	when router 4 does the redistribution.
0:00:48	And then some potential issues based on the normal advertisement rules
0:00:53	of EIGRP versus OSPF versus RIP.
0:00:56	So, let's take a look at the topology on router 4 to start.
0:01:01	And let's make sure that we are learning routes from RIP, EIGRP, and OSPF separately
0:01:07	before we get ito any redistribution.
0:01:11	So, on router 4, if we look at the Show IP Protocols,
0:01:15	this is gonna tell us what are the local processes that we are running.
0:01:19	And what are the local interfaces that have that particular protocol enabled.
0:01:23	So, we can see in this case that we are running EIGRP 1 on interface...
0:01:32	that has this particular prefix assigned.
0:01:36	Okay, which in this case is router 4's connection to the frame-relay network.
0:01:40	Also, it says that we're learning updates from this particular neighbor,
0:01:45	which is router 5 over the frame-relay.
0:01:48	The default administrative distance over that neighbor is 90,
0:01:52	Which is our default internal distance and our default external distance is 170.
0:01:58	So, essentially, the only thing that we have configured under the EIGRP process,
0:02:02	is just the network statement that is corresponding to that particular interface
0:02:06	and then the no auto-summary.
0:02:09	It says, "Automatic Summarization is not in effect."
0:02:15	Likewise, for the OSPF process,
0:02:18	it tells us what particular links that we are running the protocol on.
0:02:21	So, whatever interface has this address 45.5 and the 146.4,
0:02:27	these links are running in area 0.
0:02:30	We're learning updates from four different neighbors,
0:02:33	which implies that we have adjacencies with these devices.
0:02:37	It says, "The administrative distance for all of them is 110."
0:02:43	So, we'll see that when we do modifications of the distance.
0:02:46	We can either do this globally to the process.
0:02:49	We can do it on a per-neighbor basis or we can do it on a per-neighbor per-prefix basis.
0:02:55	But by default, the global administrative distance default value is going to apply for all routes learned from all neighbors.
0:03:05	Then, lastly, under the RIP process, it says that we're running RIP.
0:03:09	On this particualr interface, 204.12.28.0,
0:03:13	and we're learning updates from this neighbor on the link
0:03:15	using the distance of 120.
0:03:20	So, if we look at the end result of this and look at the Show IP Route,
0:03:25	we should see that we have routes installed from OSPF,
0:03:28	we have routes installed from EIGRP and form RIP.
0:03:33	We don't have any external prefixes yet because we just have the internal OSPF routes,
0:03:38	we have the internal EIGRP routes.
0:03:41	Then, again, for RIP, we have no way to distinguish the internal prefixes versus the external ones.
0:03:49	Now, before router 4 even got to this point,
0:03:52	where it was installing the RIP routes and the routing table or the OSPF or EIGRP.
0:03:57	Each of the individual protocols is gonna go through its normal path selection process.
0:04:02	In the case of RIP, we can see this by looking at the Show IP RIP Database.
0:04:08	It should show any prefixes that we're learning.
0:04:10	And based on this, we can figure out which ones are actually gonna get installed in the routing table.
0:04:16	So, we have 8 separate prefixes that are being learned on our Fast Ethernet 0/0 inteface,
0:04:23	which is the 30.0.0.0/16 to 30.1, 30.2, etc.
0:04:30	Also, it says, we have a directly connected interface,
0:04:34	Fast Ethernet 0/0 that is running the process.
0:04:39	This would then imply if I were to redistribute from RIP into OSPF or from RIP into EIGRP,
0:04:47	there should be 9 prefixes that will be included.
0:04:51	The 8 that show up in the routing table as RIP,
0:04:55	when we look at the Show IP route RIP,
0:05:01	So, the 8 subnets were learning there
0:05:03	plus the directly connected interface that is running the protocol.
0:05:08	We'll see that this is gonna be our implicit directly connected redistribution.
0:05:15	The only case that where this directly connected link would not be redistributed
0:05:20	is if we were to manually issue the redistribute command under the OSPF process or under the EIGRP process.
0:05:27	And then exclude interface Fast Ethernet 0/0.
0:05:32	So, the explicit redistribute connecting command, this is gonna override any of the dynamic interfaces
0:05:39	or the interface that are running the dynamic protocols.
0:05:44	Then likewise, for EIGRP, if we were to look at the Show IP EIGRP Topology,
0:05:51	this is showing us the routes that should be installed in the routing table
0:05:56	that have valid, feasible distance values.
0:06:01	So, these are the dynamic routes that are coming from our different neighbors.
0:06:04	In this case, router 5.
0:06:06	Then we also have our connected link that is running the process, 155.28.0.0/24.
0:06:14	So again, just like RIP, the end result to this would be that if I were to redistribute EIGRP into OSPF,
0:06:21	any routes that are in the routing table as EIGRP,
0:06:26	so if we Show IP Route EIGRP,
0:06:30	plus the routes that are in the topology as connected interfaces,
0:06:34	those are the ones that are candidate for the redistribution process.
0:06:40	Then likewise, for OSPF, if we Show IP Route OSPF,
0:06:45	and Show IP OSPF Interface Brief,
0:06:48	the dynamically learned OSPF prefixes plus those two connected interfaces,
0:06:53	those would be candidate to be redistributed from OSPF into RIP
0:06:57	or from OSPF into EIGRP.
0:07:00	So, next, let's look at the redistribution between the OSPF and the RIP process.
0:07:05	First step is taht we go under the global routing process.
0:07:10	So, if we look at our configuration so far,
0:07:12	we have OSPF process ID 1, EIGRP AS 1, and then the global RIP process.
0:07:19	So, we'll say under the RIP process, "I want to redistribute OSPF process number 1."
0:07:26	Again by default, there is no seed metric value.
0:07:30	So I either need to specify this here with the metric
0:07:33	or I could specify the default metric.
0:07:38	So, if I said that the default metric was 5,
0:07:41	this would apply to other none OSPF protocols
0:07:46	becasue with OSPF, I'm manually specifying the particular metric value that should be associated with that.
0:07:54	So really, whichever way that you do the implementation,
0:07:57	it's gonna end up in the same result that the routes should be installed in the RIP database
0:08:02	and they're gonna get whatever seed metric you're either specifying on a particular protocol.
0:08:07	Or it's gonna go back to the default metric value.
0:08:12	Now, without looking at any other routers in the RIP topology,
0:08:17	we should be able to tell at least here locally on router 4,
0:08:20	whether the redistribution was actually successful.
0:08:24	And we can see this by looking at the Show IP RIP Database.
0:08:30	We should now see in addition to our local connected route,
0:08:35	the 8 routes that we were learning from BB3.
0:08:39	We also have a bunch of this prefixes that say, they are redistributed.
0:08:45	So, if we look at this output again, Show IP RIP Database and include just the keyword, "redistributed",
0:08:52	we see that this is gonna be the routes in the routing table as OSPF,
0:08:58	in addition to any connected routes that are runnning the OSPF process.
0:09:04	So, when we compare the Show IP Route OSPF output,
0:09:07	we can see the first prefix, 155.28.7.0.
0:09:12	This did make it into the RIP database.
0:09:17	As did the 9.0, the 37.0, etc.
0:09:23	Additionally, we see 155.28.146.0.
0:09:28	This is not showing up as an OSPF route in the table because this is directly connected.
0:09:34	So, if we Show IP Route Connected, this 146.0, this is being included
0:09:40	as is the 45.0 because these are the two connected interfaces that are running the OSPF process.
0:09:50	Note that this is not going to include serial 0/0/0.1
0:09:56	because although this is a connect prefix, it's not running the OSPF process.
0:10:04	So again, by default, when we redistribute OSPF into RIP is gonna be whatever routes are in the routing table as OSPF
0:10:11	plus the connected links that are running the OSPF process.
0:10:16	Now, if I wanted to include an additional route,
0:10:19	let's say that I want to advertise my loopback interface into RIP,
0:10:24	and I wanna do this via connected redistribution,
0:10:28	I could go under the RIP process
0:10:31	and say redistribute conected and I'll give these a metric value of 2.
0:10:39	If we now look at the result in the RIP database, if we Show IP RIP Database and include the redistributed routes,
0:10:47	we should now see that our loopback is included.
0:10:53	But also the other connected links that were not running OSPF.
0:10:59	So, if we look at the Show IP Route Connected
0:11:02	and compare this to the Show IP OSPF Interface Brief,
0:11:07	the explicit redistribute command is including more than what the OSPF to RIP redistribution wise.
0:11:19	Now, ultimately, whichever method that you choose,
0:11:22	is gonna be dependent on whether or not you want to allow all routes to be redistributed
0:11:28	or whether you want to be very specific as to whic particular prefixes will be advertised.
0:11:35	Now, the case where this could become a problem is if I were to say that on router 4,
0:11:43	I have this link that goes to VLAN 146.
0:11:50	and then I have this link that goes to BB3.
0:11:56	Okay, this is the 204.12.28.0/24 network.
0:12:04	The link connected to BB3, this is running RIP.
0:12:08	The link connected to VLAN 146, this is running OSPF.
0:12:15	So again, when I redistribute from OSPF to RIP,
0:12:18	it's gonna be any routes that are actually learned from the OSPF process.
0:12:21	plus the actual connected interface itself.
0:12:27	Now, if I other connected interfaces on router 6,
0:12:31	let's say the...
0:12:35	Let's say a loopback interface there.
0:12:38	I have loopback...
0:12:41	Loopback 0.
0:12:43	And this is the prefix 150.28.4.0/24.
0:12:51	And I wanna advertise this into the RIP process.
0:12:56	Now, I have other connected interfaces as well.
0:13:00	I have this link that's going to the frame-relay network.
0:13:03	I have this point-to-point link that's going into router 5.
0:13:07	If I simply say redistribute connected under the RIP process,
0:13:10	it's basically going to match all of my connected links.
0:13:14	Which is then the VLAN 46, the loopback, the frame-relay and the point-to-point serial.
0:13:23	Let's also assume in this case that I do not want to redistribute the link that's goint to frame-relay
0:13:30	and the link that's going to router 5.
0:13:34	So, I wanna advertise the loopback to BB3 but I don't wanna advertise these other 2 serial interfaces.
0:13:42	So, this means we would need a separate redistribute statement
0:13:46	and we're gonna match which of the particular prefix that we do want to include.
0:13:52	So, on router 4, the way that we do this, is where the route map.
0:13:57	I'll say the route map is called Connected to RIP.
0:14:00	And by default, this has a permit 10 sequence number.
0:14:06	From here, I could either call an access list or a prefix list
0:14:10	or it could match the connected interface directly.
0:14:13	So, I'll simply say, "Match Interface Loopback 0."
0:14:19	Now, under the RIP process, I'm gonna Redistribute Connected.
0:14:24	I still need to set a seed metric. Let's say metric 2.
0:14:29	but now,I'm gonna filter this redistribution through the route map
0:14:33	connected to RIP.
0:14:38	When we look at the end result of this in the Show IP RIP Database
0:14:43	and we look at the redistributed routes,
0:14:46	we see that the loopback interface was advertised
0:14:49	but the frame-relay interface has now been filtered
0:14:55	and the point-to-point serial that is going to router 5.
0:14:59	We can see this if we compare the RIP database output to the Show IP Route connected.
0:15:06	So, 155.28.0.0, that is not a RIP database.
0:15:11	Nor as 155.28.45.0.
0:15:16	The loopback is the 204 network, that's gonna be in the RIP database because that's actually running the protocol.
0:15:23	There's a network statement that's matching it.
0:15:26	But now notice that the Ethernet that was running OSPF,
0:15:31	this is now being excluded from the RIP redistribution.
0:15:37	Now, this is not necessarily a bad thing.
0:15:40	It just depends on what our end goal of the design is.
0:15:44	If I want to advertise the loopback plus the VLAN 146 interface,
0:15:49	then my current configuration is not going to accomplish that.
0:15:53	What I'm actually doing here is allowing the loopback to be redistributed,
0:16:02	not the connected VLAN 146, not either the connected serials.
0:16:07	But then any dynamic information that is learned form OSPF.
0:16:13	The reason why that these three connected links are being denied,
0:16:17	is that the route map on router 4 has an implicit deny after sequence number 10.
0:16:28	So, just like an access list or a prefix list,
0:16:31	the route map is always gonna end in an implicit deny.
0:16:35	This now means that any interface besides loopback 0 will be denied from being redistributed into the RIP process.
0:16:45	Eventhough when we look at the configuration under the RIP process,
0:16:50	I have two redistribute statements.
0:16:52	One that is going from OSPF to RIP and one from connected to RIP.
0:16:57	Since I am explicitly listening the conected redistribution.
0:17:01	This means it is then going to override the connected links that are running the OSPF process.
0:17:08	Now, in reality, this is the design case that you would want as the default behavior.
0:17:14	Becasue it essentially gives us more control as to what particular routes are advertised into the routing database.
0:17:22	So, if I wanted to advertise the loopback but none of the other connected prefixes,
0:17:27	this is I'm gonna do it with this config.
0:17:30	However, if I want to advertise the loopack plus the interface that was in OSPF,
0:17:36	it means that I would also have to permit that in the connected to route map.
0:17:43	So, I can either do this unde the same sequence number 10.
0:17:47	If we Show Run Section Route Map.
0:17:52	Or I could put an additional sequence after number 10
0:17:55	that's matching that additional interface or matching an access list or a prefix list
0:18:00	that is matching the address information for the link.
0:18:06	So if we look at the Show IP Route.
0:18:10	Show IP Route Connected.
0:18:13	The prefix in question for that link is 155.28.146.0/24.
0:18:20	If I then wanna include this in the connected redistribution,
0:18:24	I could say match interface Fast Ethernet 0/1.
0:18:28	Call an acces list that's matching it or use a prefix list.
0:18:33	So, I'll say IP Prefix List Connected_FA0/1
0:18:39	Permit and then the actual...
0:18:44	Prefix plus the length.
0:18:47	So, 155.28.146.0/24.
0:18:53	Now, as I mentioned, we could also use an access list to do this.
0:18:57	However, the shortcoming of using the ACL
0:19:00	is that we can match only on the address field and not on the subnet mask.
0:19:06	Whereas the prefix list,
0:19:08	as we talked about this before for filtering with the distribute list and RIP or distribute list and EIGRP,
0:19:14	this woould be the preferred method of matching a route.
0:19:17	becasue it gives us the flexibility to match both the address field and the subnet mask at the same time.
0:19:26	So, now that I have the prefix matched,
0:19:29	next step would be to reference it from the route map.
0:19:32	So, I have route map connected to RIP.
0:19:36	I need a new sequence. We'll say Permit 20.
0:19:39	Then match IP Address Prefix List Connected_FA0/1.
0:19:51	Now, the common mistake here to watch out for,
0:19:54	is that when you say Match IP Address.
0:19:57	If I were to say Match IP Address Connected_FA0/1
0:20:02	That would be calling an extended or standard name access list.
0:20:09	So, if I were to say Match IP Address Connected_FA0/1,
0:20:15	this would be calling an ACL, not the prefix list.
0:20:20	If I want to match the prefix list, I need to add that additional keyword,
0:20:24	prefix list in the match IP address prefix list and then the name.
0:20:29	Now, we should be able to see the end result of this if we now look at the Show IP RIP database,
0:20:35	and again look at the redistributed routes.
0:20:39	So, Show IP RIP Database Include Redistributed.
0:20:43	We could see now, not only does it include the loopback
0:20:47	which is the 150.28.4.0. But now, that VLAN 146, which is 155.28.146.0/24.
0:20:58	So, really in the end, it doesn't matter which way you do the implementation.
0:21:02	It's only dependent on whether you want to allow all routes or just a subset of routes.
0:21:08	If you wanna allow everything, then you could just say Redistribute Connected,
0:21:11	or use whatever the interfaces that are running the protocols.
0:21:16	So, if I were to remove under the RIP process here,
0:21:20	if we Show Run Section Router RIP,
0:21:26	and we say No Redistribute Connected,
0:21:30	so the only statement I have now is Redistribute OSPF 1, Metric 1.
0:21:35	If we look at the result of this in the RIP database,
0:21:39	it does include, or will include in a second here when it converges.
0:21:46	It will include the VLAN 146.
0:21:54	So, that's our connected interface running OSPF.
0:21:57	But notice that it doesn't include the loopback.
0:22:01	Because when we look at the Show IP OSPF Interface Brief,
0:22:04	the loopback is not in the OSPF process,
0:22:07	so it implies that it's not gonna get included when we redistribute OSPF to RIP.

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