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STUDY
AppleTTalk
Cisco IOS
IPX
Network
Windows
| Route Source | Default Distance |
|---|
|
Connected interface | 0 | |
Static route out an interface | 0 | |
Static route to a nest hop | 1 | |
EIGRP summary route | 5 | |
External BGP | 20 | | Internal EIGRP | 90 | | IGRP | 100 | | OSPF | 110 | | ISIS | 115 | | RIPv1,v2 | 120 | | EGP | 140 | | External
EIGRP | 170 | | Internal BGP | 200 | | Unknown | 255 |
Note
| Characteristic | RIPv1 | RIPv2 | IGRP | EIGRP |
|---|
| Count
to infinity | X | X | X | | | Split
horizon | X | X | X | X | | Hold-down
timer | X | X | X | | | Triggered
updates with route poisoning | X | X | X | X | | Load
balancing - Equal paths | X | X | X | X | | Load
balancing - Unequal paths | | | X | X | | VLSM
support | | X | | X | | Routing
algorithm | B-F | B-F | B-F | DUAL | | Metric | Hops | Hops | Comp | Comp | | Hop-count
limit | 16 | 16 | 100 max 255 | 100 max 255 | | Scalability | Med | Med | Large | Large |
Note:
B-F: Bellman-Ford
DUAL: Diffusing Update Algorithm
| Characteristic | OSPF | ISIS | EIGRP |
|---|
| Hierarchical
topology-Required | X | X | | | Retains knowledge of all
possible routes | X | X | X | | Route summarization-Manual | X | X | X | | Route
summarization-Automatic | | | X | | Event-triggered
announcements | X | X | X | | | | | | Load
balancing-Equal paths | X | X | X | | Load balancing-Unequal
paths | | | X | | VLSM support | X | X | X | | Routing
algorithm | Dijkstra | ISIS | DUAL | | Metric | Cost | Cost | Comp | | Hop-count
limit | 200 | 1024 | 100 | | Scalability | Large | Very Large | Large |
Note
| Characteristic | RIPv1 | RIPv2 | IGRP | EIGRP | OSPF |
|---|
| Distance
vector | X | X | X | X | | | Link-state | | | | | X | | Classful
(auto route summ.) | X | X | X | X | | | Classless (VLSM
support) | | | | X | X | | Proprietary | | | X | X | | | Scalability | Small | Small | Medium | Large | Large | | Convergence
time | Slow | Slow | Slow | Fast | Fast |
Note
| Class | Address | Number of Networks | Number of Hosts
|
| Class A | 1.0.0.0 to 126.0.0.0 | 126 (27 - 2) | 16,777,214 | | Class
B | 128.0.0.0 to 191.255.0.0 | 16,384 (214) | 65,532 | | Class
C | 192.0.0.0 to 223.255.255.0 | 2,097, 152 (221) | 254 | | Class
D | 224.0.0.0 to 239.255.255.254 | Reserved for multicast
addresses | | | Class E | 240.0.0.0 to
255.255.255.255 | Reserved for research | |
OSPF
| Link | Cost |
|---|
| 56-kbps
serial link | 1785 | | T1 (1.544 Mbps serial link) | 64 | | Ethernet | 10 | | 16-Mbps
Token Ring | 6 | | FDDI | 1 |
OSPF
| LSA Type | Name | Description |
|---|
| 1 | Router
link entry
(record)
(O-OSPF)
(Router link states) | Generated by each router for each area it belong
to.
Describes the states of the router's link to the area. These are only
flooded within a particular area. The link status and cost are two of the
descriptors provided. | | 2 | Network link entry
(O-OSPF)
(Net link states) | Generated by DRs in multiaccess network. Describe the
set of routers attached to a particular network. These are flooded within
the area that contains the network only. | | 3 or 4 | Summary
link entry
(IA-OSPF Inter-area)
(Summary net link states and summary ASB link states) | Originated by
ABRs. Describes the links between the ABR and the internal routers of a
local area. These entries are flooded throughout the backbone are to the
other ABRs. Type 3 LSAs describe routes to networks within the local area
and are sent to the backbone area. Type 4 LSAs describe reachability to
ASBRs. These link entries are not flooded through totally stubby areas. | | 5 | Autonomous
system external link entry
(E1-OSPF external type 1)
(E2-OSPF external type 2)
(AS external link states) | Originated by the ASBR. Describes routes to
destinations external to the autonomous system. Are flooded throughout an
OSPF autonomous system except for stub, totally stubby, and no-so-stubby
areas. |
Note
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