I need a clarification on the behaviour of BGP with equal cost path (maximum-paths 2)
I have 1841 Router with Dual leased line named my ISP named ISP-1. I was runnning BGP between my router(AS 500) & ISP-1 (AS100). Since the two links are equal cost, by using maximum-paths command i was loadbalancing the traffic. "show ip route" command was showing that destination was having two paths one via ISP-2 & another via ISP-1
I surrendered one of the link to ISP-1 and procured a new link from ISP-2(200) and running BGP as like previous configuration.
But after this inspite of "maximum-paths 2" command only one route is appearing in the routing table of my router.
Why & What is the meaning of this behaviour of the router when connected to different AS. Why it is not load balancing or taking multiple paths when connected to different AS. But it is working if the BGP peering is same AS
can you please help me in understanding this concept and solution
I have just gone thru a document in Cisco. It states that Loadbalancing between two different AS is not possible unlike Loadbalancing between same AS. The solution is to configure weight parameter such a way that routes received from ISP-1 should be higher than 0 for prefixes 0-128 and configure weight parameter such a way that routes received from ISP-2 should be higher than 0 for prefixes 128-254.
I believe my case is also the same.Please check the "Load Sharing with BGP in Single and Multihomed
Environments: Sample Configurations" document. It gives the solution to my problem
As mentioned i have two ISPs (ISP-A [AS 100] & ISP-B [AS200]) connected to one router. I am accepting some prefixes from both the ISP, say for example i am accepting prefix 126.96.36.199 /24 from both the ISPs.
I noticed that randomly BGP chooses either ISP-1 or ISP-2 as the path to 188.8.131.52
What is the logic behind this best path selection. I donot think is following BGP best path selection ie, Adminweight, Local preference, IGP, MED etc.
We are trying to enable load balancing on Cisco 1801 across 2 Mbps WAN links. When tested separately, each link is reaching its full capacity. When aggregated, the links are hardly reaching 1.5 Mbps throughput.
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