Term
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Definition
| Once a TCP connection has been established, this message is sent and includes a set of parameters that have to be agreed upon before a full BGP adjacency can be established |
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Term
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Definition
Message includes the following information:
- Unreachable routes information
- Path attribute information
- Network-layer reachability information (NLRI) ---This field contains a list of IP address prefixes that are reachable by this path.
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Term
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Definition
| causes the bgp forwarding table to be completely deleted. used to force all neighbors to resend their bgp table |
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Term
neighbor 10.0.0.2 remote-as 100 |
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Definition
| causes bgp to peer with the neighbor and routing begins |
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Term
| ip route 0.0.0.0 0.0.0.0 10.0.0.1 210 |
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Definition
| configures a default static route with a distance of 210. Sets a gateway of last resort |
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Term
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Definition
| takes a network which is in the routing table and it sets it as the gateway of last resort. it establishes this route as the only default route |
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Term
| ip as-path access-list 1 deny ^100$ |
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Definition
| configures a special kind of access list to match bgp routes with an AS_PATH attribute that begins and ends with the number 100 |
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Term
| neighbor filter-list 1 out |
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Definition
| applies the access list to routing information sent to a neighbor |
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Term
| neighbor update-source lo0 |
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Definition
| configures the router to use the loopbacks ip address as the source ip address for all bgp messages sent to that neighbor |
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Term
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Definition
configures the router to become a valid gateway by overriding the next-hop address with its own ip address.
critical that the opposite router becomes a valid gateway on wan links if one side goes down |
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Term
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Definition
| used to define a route-map and sets it to permit with a sequence number of 10 |
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Term
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Definition
| command sets the local preference to 200 which adjusts the outbound traffic to prefer a certain link over others |
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Term
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Definition
| stes the MED to 50. Indicates to external neighbors the preferred path into an AS. Lower metric preferred |
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Term
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Definition
| configures the router to inject a summary address into bgp |
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Term
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Definition
Increases the TTL which enables bgp to establish ebgp connections beyond one hop
command enables bgp to perform load balancing |
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Term
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Definition
| implements a route-map in the bgp process. command applies the route-map to filter incoming or outgoing bgp routes to a neighbor |
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Term
| neighbor 10.0.0.1 weight 100 |
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Definition
| used to change the weight for all updates from a neighbor. only applicable locally and the highest weight is preferred |
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Term
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Definition
| command applies a prefix-list to routes that come from or go to a neighbor |
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Term
| bgp default local-preference |
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Definition
| used to change the default local preference for all routes advertised by the router. |
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Term
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Definition
| displays entries in the bgp table. networks and their next-hops are displayed along with the weight, local preference, MED, and AS path |
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Term
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Definition
| dispays detailed information about the TCP and BGP connections to neighbors. The bgp state and neighbor relationships status are displayed |
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Term
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Definition
| displays the status of all bgp connections. command is a useful alternative to the show neighbors command |
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Term
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Definition
| displays bgp routes that were not installed in the rib and the reason they were omitted |
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Term
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Definition
| a bgp router should not use or advertise, a route learned by IBGP, unless that route is local or learned from an IGP |
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Term
keepalive
open
update
notification |
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Definition
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Term
achieve an ISP-independent solution
scalability of solution
resistance to failure of a single ISP
load sharing between ISP's |
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Definition
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Term
Multiple connections to other AS's
ISP
Routing policy and route selection need to be manipulated |
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Definition
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Term
Only a single connection to an ISP
Lack of memory/processor power
Limited knowledge of BGP and route filteringWhen |
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Definition
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Term
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Definition
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Term
Version
My AS
Hold time
Router ID |
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Definition
| Parameters in open message |
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Term
unreachable routes info
path attribute info
NLRI info |
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Definition
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Term
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Definition
| field contains a list of IP address prefixes that are reachable by a certain path |
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Term
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Definition
| info includes a list of the full path of BGP AS's numbers necessary to reach the destination |
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Term
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Definition
| each BGP speaker is assumed to have a neighbor statement for all other IBGP speakers in the AS |
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Term
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Definition
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Term
AS numbers of enterprise and ISP
ip addresses of all involved neighbors
networks to be advertised into BGP |
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Definition
info necessary to implement BGP |
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Term
aggregate-address network mask
summary-only |
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Definition
| command used to advertise only the summary address and not the component routes |
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Term
IP addressing plan
Network topology
BGP relationship with ISP |
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Definition
| Requirements to consider before deploying BGP |
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