What is Aigp?
What is Aigp?
AIGP stands for Accumulated IGP Metric Attribute which is specified in RFC 7311. IGPs (Interior Gateway Protocols) are designed to run within a single administrative domain and they make path-selection decision based on metric value.
What is IGP and BGP?
IGP is used to establish and distribute routing information to routers within Autonomous System (AS), the most common routing protocols within this category are RIP (Routing Information Protocol) and OSPF (Open Shortest Path First) [2]. BGP is used to route traffic between ASs within the internet.
How many BGP attributes are there?
Four
BGP Attributes. BGP chooses a route to a network based on the attributes of its path. Four categories of attributes exist as follows: Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers.
Why do we need IGP in BGP?
As we know, IGP stands for Interior Gateway Protocol and represents a group of routing protocols that run within a single administrative domain. IGP selects the shortest path between the two nodes based on distance. The distance here is a sum of metrics of all the links that belong to a given path.
What is Aigp BGP?
AIGP is a non-transitive attribute that includes the accumulated IGP metric. BGP routers advertise this AIGP metric to neighbors in other ASes. This allows BGP routers to select the best path based on the end-to-end IGP metric. To make this possible, AIGP makes some changes to the BGP best-path algorithm.
What is difference between iBGP and Ebgp?
EBGP stands for External Border Gateway Protocol. IBGP stands for Internal Border Gateway Protocol. It runs between two BGP routers in different autonomous system. It runs between two BGP routers in the same autonomous system.
How do I set BGP attributes?
SUMMARY STEPS
- enable.
- configure terminal.
- router bgp as-number.
- neighbor { ip-address | ipv6-address } path-attribute treat-as-withdraw { attribute-value | range start-value end-value } in.
- Repeat Step 4 to configure other attributes not in a range or to configure a different neighbor.
- end.
What is a BGP attribute and where is it used?
BGP communities can be used to tag routes with the purpose of enforcing routing policies. To give an example, when a route received has a specific BGP community attached to it, the router can perform various operations on other BGP attributes of that route.
How does BGP MED work?
The BGP MED attribute, commonly referred to as the BGP metric, provides a means to convey to a neighboring Autonomous System (AS) a preferred entry point into the local AS. BGP MED is a non-transitive optional attribute and thus the receiving AS cannot propagate it across its AS borders.
Can BGP be used AS IGP?
If all routers in an AS are BGP speakers, no interaction is necessary between BGP and an IGP. In such cases, all routers in the AS already have full knowledge of all BGP routes. The IGP is then only used for routing within the AS, and no BGP routes are imported into the IGP.
