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34 Cards in this Set
- Front
- Back
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IGP |
Internal Gateway Protocol |
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Types of Internal Gateway Protocols |
RIP RIPv2 OSPF |
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RIPv1 only understands what IP addresses? |
Class-full IP addresses (/8's /16's /24's) |
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distance vector protocols, what are they and what protocols. |
-share their entire routing table with neighboring routers at specified intervals and include a distance (sometimes called a hop count) for each route. Routers use the route with the shortest hop count seen for delivery. |
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Link state protocols, what are they and what protocols. |
Link state protocols only tell other participating routers about their neighbors (links) and costs to reach their neighbors. Then each router uses this information to build a graph and applies "Dijkstra's Algorithm" to find the shortest path to each network.
OSPF |
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OSPF |
Open Shortest Path First |
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OSPF areas (0, 1,...) |
There is one backbone area (area 0) and all other areas must border on the backbone area
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ABR |
Area Border Router, A router with interfaces on more than one area is known as a Area Border Router (ABR) and can summarize the routing information it advertises to the backbone. |
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ASBR |
Autonomous System Border Router can inject routes learned from other AS's and via other routing protocols into the OSPF AS |
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Types of routers in OSPF |
Internal router Backbone router Autonomous System Border Router (ASBR) |
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OSPF Costs |
Costs are a 16 bit number between 1 and 65535
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HELLO packet
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used on broadcast network segments to discover other routers on that network segment |
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DR |
designated router (DR) |
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BDR |
backup designated router (BDR) |
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What type of router is this ospf interface conf t int 1/0 ip ospf authentication message-digest ip ospf message-digest-key 1 md5 cis4930 ip ospf cost 10000 |
Cisco |
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CIDR |
Classless Inter-Domain Routing |
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show ip ospf neighbor (Cisco or Juniper?) |
cisco / quagga |
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show ospf neighbor (Cisco or Juniper?) |
JunOS |
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show ip ospf interface (Cisco or Juniper?) |
Cisco` |
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show ospf interface (Cisco or Juniper?) |
Juniper |
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show ip route (Cisco or Juniper?) |
Cisco |
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show route (Cisco or Juniper?) |
Juniper |
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BGP version 4 |
Border Gateway Protocol |
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Autonomous systems |
defined as any group of networks which share administrative control and internal routing protocols |
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When two routers are using BGP to exchange routing information they are said to be bgp __________. |
peering |
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BGP TCP port |
port 179 |
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BGP is a _____________ protocol. |
Path Vector |
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EBGP |
exterior BGP, means you are using BGP to exchange routing information with a different Autonomous System number |
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IBGP |
Internal
IBGP means you are exchanging routing information within your Autonomous System |
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key components of a BGP configuration |
- Your AS number - Neighbor AS number (same for IBGP, different for EBGP) - Type of connection (specified on JunOS, implied by your AS and peer AS on IOS) - Neighbor address - Local address (not needed on IOS) - Export policy - Import policy |
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show bgp summary |
will show you a brief summary of your bgp neighbors |
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show route receive-protocol bgp |
can be used to review the routes you are sending or receiving from a particular neighbor via bgp |
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show ip bgp summary |
Cisco/quagga |
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Cisco commands to edit ospf router |
# conf t # router ospf 1 #router-id 10.6.5.1 # network 10.6.5.0 0.0.0.255 area 0 # network 10.6.4.64 0.0.0.3 area 1 # network 10.6.7.128 0.0.0.127 area 0 |
