I am new for BGP. One internet route link will be down with AT&T notice, traffic should go with other route and ISP. How to monitoring BGP traffic and see it is work to other isp? When Att line back to normal, how to make traffic back to ATT? please help.
We have two cisco routes do a bgp and HSRP, one link is with ATT, other link is with Internap. With Att maintain, line with AT&T will be down tonight, by setup, when link down with ATT, traffic should go with Internap.
I just run show ip bgp summary and show ip bgp route-map and see bgp is up and working.
I worry when ATT line down, traffic go with Internap, then when ATT line back, does traffic automatic back to ATT line, or still keep on the Internap, I have to enter command to make traffic back?
I hope I can get some single command to mornitoring bgp traffic see traffic where is going.
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