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31 Cards in this Set
- Front
- Back
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Enable BGP Step 1 -
Enables a BGP routing process, which places the router in router configuration mode. |
Router(config)# router bgp as-number
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Enable BGP Step 2 -
Flags a network as local to this autonomous system and enters it to the BGP table. |
Router(config-router)# network network-number [mask network-mask] [route-map route-map-name]
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Specifies a BGP neighbor.
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Router(config-router)# neighbor {ip-address | peer-group-name} remote-as as-number
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Displays whether a neighbor supports the route refresh capability.
If the specified router supports the route refresh capability, the following message is displayed: Received route refresh capability from peer. |
Router# show ip bgp neighbors ip-address
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Performs a soft reset on the connection specified in the command.
The neighbor-address argument specifies the connection to be reset. Use the * keyword to specify that all connections be reset. |
Router# clear ip bgp {* | neighbor-address | peer-group-name} soft out
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display entries in the BGP routing table
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show ip bgp
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display information about the BGP and TCP connections to neighbors
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show ip bgp neighbors
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Disables synchronization between BGP and an IGP.
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Router(config-router)# no synchronization
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Sets an MED.
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Router(config-router)# default-metric number
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Disables automatic network summarization.
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Router(config-router)# no auto-summary
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Configures the cluster ID.
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Router(config-router)# bgp cluster-id cluster-id
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Resets a particular BGP connection.
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Router# clear ip bgp neighbor-address
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Resets all BGP connections.
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Router# clear ip bgp *
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BGP creates and maintains connections between peers, using what port ___
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TCP Port 179
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BGP connections are maintained by ....
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periodic keepalives
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Any change in the network
results in a _____ |
triggered update
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It is possible to manipulate BGP traffic flow by using _________
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attributes
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What are the four different message types are used in BGP according to RFC 1771:
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■ Open messages —Used to establish connections with peers.
■ Keepalives —Sent periodically between peers to maintain connections and verify paths ■ Update messages —Contain paths to destination networks and the path attributes ■ Notification—Used to inform the receiving router of errors that cause the connection to be closed. |
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BGP will propagate
1) the prefix and the prefix mask together 2) only prefix 3) only prefix mask |
1) the prefix and the prefix mask together
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What is the hop-by-hop paradigm?
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This paradigm is the capability to influence which router will be the next-hop router, potentially dictating it at every router and thus influencing the entire path of the traffic, hop by hop.
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Traffic can be directed on either the ____________ or both the
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source address
source and destination addresses |
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Policy-based routing does not affect the destination of the packet. It affects the path used to get to the destination.
True / False |
True!
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Policy-based routing does not allow traffic sent into another autonomous system to take a different path from the one that would have been chosen by that autonomous system.
True / False |
True!
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It is possible to influence how traffic will be routed within that autonomous system.
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False
It is possible to influence only how traffic will get to a neighboring autonomous system, not how it will be routed within that autonomous system. |
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What are the 7 BGP attributes
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1) Weight
2) Local preference 3) Multi-exit discriminator 4) Origin 5) AS_Path 6) Next hop 7) Community no-export—Do not advertise this route to EBGP peers. no-advertise—Do not advertise this route to any peer. internet—Advertise this route to the Internet community; all routers in the network belong to it. |
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Open messages
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Used to establish connections with peers.
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Keepalives
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Sent periodically between peers to maintain connections and verify paths
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Update messages
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Contain paths to destination networks and the path attributes
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Notification
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Used to inform the receiving router of errors that cause the connection to be closed.
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Describes BGP4, the current version of BGP
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RFC 1771
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A BGP Packet header consists of how many fields?
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Marker - 16 Bytes
Length - 2 Bytes Type - 1 Byte Data - Variable |
