What is the default local preference BGP?

100
Local preference is a well-known and discretionary BGP attribute. Default value is 100. The path with the highest local preference is preferred.

How do I change local preference in BGP Juniper?

Step-by-Step Procedure

1. Configure the interfaces. [edit interfaces] user@R1# set fe-1/2/0 unit 4 family inet address 1.12.0.1/30 user@R1# set lo0 unit 2 family inet address 10.255.71.24/32.
2. Configure the local autonomous system.
3. Configure the external peering with Device R2.
4. Configure OSPF.
5. Configure the routing policy.

What is the default local preference value assigned to a prefix received from a BGP peer?

The default value for the local preference is 100. This also means that a route that has no local preference value is treated as if it had a local preference of 100.

What is BGP local preference attribute?

Local preference is the second BGP attribute and is used to choose the exit path for an autonomous system. The BGP preference has to be set inbound on routes being received to influence the outbound routing behaviour. A higher local preference is preferred and the default is 100.

What is the difference between local preference and Med?

Hi JNL, For the first question, the Local_Pref attribute indicates the BGP preference of a device and helps determine the optimal route when traffic leaves an AS. The multi-exit discriminator (MED) attribute helps determine the optimal route when traffic enters an AS.

What is the default weight for a locally originated BGP route?

32768
Weight is a simple number in the range of 0 through 65535, and the higher the weight value, the higher the preference for that path. When the prefix is locally generated, it will get a weight of 32768. Otherwise, the default weight is 0 for a prefix.

How do I find my best path in BGP?

BGP Table path selection

1. Prefer the highest local-preference value.
2. Prefer the shortest AS-path length.
3. Prefer the lowest origin value.
4. Prefer the lowest MED value.
5. Prefer routes learned from an EBGP peer over an IBGP peer.
6. Prefer best exit from AS.
7. For EBGP-received routes, prefer the current active route.

Is BGP local pref transitive?

Local Preference is transitive. It is a Well Known attribute meaning it must be supported by all BGP implementations, and all well known attributes are transitive.

What is default BGP weight?

The weight attribute is a Cisco proprietary technology and considered as first attribute in BGP. The default value of weight is 0 and the range is from 0 to 65535.

How does BGP choose a route?

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. For example, AS path, origin, and next hop.

Which is preferred Ibgp or Ebgp?

The BGP route with the highest local preference value is preferred. The LOCAL_PREF path attribute is always advertised to IBGP peers and to neighboring confederations. It is never advertised to external BGP (EBGP) peers.

Does BGP prefer eBGP over Ibgp?

Prefer strictly external BGP (EBGP) paths over external paths learned through internal BGP (IBGP) sessions. Prefer the path whose next hop is resolved through the IGP route with the lowest metric.

Why Ibgp route preferred over eBGP?

So if a route is learnt over eBGP and iBGP at the same time, the routes learnt over eBGP take preference and make their way into the routing table, since it has a lower AD value of 20 as compared to the AD value of 200 for iBGP.

What is the difference between external BGP eBGP and internal BGP Ibgp )?

BGP uses the same concept: If a BGP session is established between two neighbors in different autonomous systems, the session is external BGP (EBGP), and if the session is established between two neighbors in the same AS, the session is internal BGP (IBGP).

Why is eBGP better than Ibgp?

Difference in iBGP vs eBGP – A route learnt from an eBGP peer will be advertised back to another IBGP or eBGP neighbor by default. A route learnt from an IBGP peer will not be advertised back to another iBGP neighbor by default. AS path is not prepended to the route when advertised to an IBGP peer.

What is the difference between external BGP Ebgp and internal BGP Ibgp )?

Does BGP prefer Ebgp over Ibgp?

Why does Junos OS choose the OSPF route instead of BGP?

In the same scenario, Junos OS chooses the OSPF route, because of the default preference 10 for an internal OSPF route and 150 for an external OSPF route, which are both lower than the 170 preference assigned to all BGP routes.

What is the default local preference for BGP routes?

By default, the local preference is 100 for either route. When the local preferences are equal, Junos OS has rules for breaking the tie and choosing a path. (See Understanding BGP Path Selection .)

How to achieve multivendor compatibility between Junos and BGP?

Another way to achieve multivendor compatibility is to include the advertise-inactive statement in the EBGP configuration. This causes the routing table to export to BGP the best route learned by BGP even if Junos OS did not select it to be an active route.

What is the default preference for static-Label-Switched-Path in Junos?

Starting in Junos OS Release 10.4, if you configure a static-label-switched-path the default preference value is 6. The previous configuration statement static-path is hidden in Junos OS Release 10.4 and later releases.