i have a router which is connected to two isp. ISP1 and ISP2. we are running bgp with both of them. for inbound traffic we are receiving the traffic almost as expected but for outbound traffic all the traffic is following ISP1 always. and we do not wanted like that and need to send traffic to ISP1 and some to ISP2 (both ISP are sending default route through BGP). after doing many changes we did not get desired results so i went with other solution.
! Step 1
! Define SLA to track the default route and set default route according to availability.
! SLA for ISP1 as default Gateway
ip sla 15
! ISP1 Side IP
ip sla schedule 15 life forever start-time now
!!!!!! Track for SLA 15 to check the status of next hop ISP1
track 15 ip sla 15 reachability
delay down 120 up 1
! Default route for all traffic is ISP1 with default metrics. and Track the availability of ISP1.
ip route 0.0.0.0 0.0.0.0 172.16.180.161 track 15
! Default route for all traffic to ISP2 with metric 15 set lower then 20 (EBGP)
So i will try tomorrow as per your suggestion, to advertise first two most specific subnets plus complete /22 subnet to isp1 and other two specific subnet plus /22 summary route to isp2. it should solve my inbound traffic issue.
For outbound if i try maximum path will it solve both things or not? Kindly advice
And for PBR i replied above that " ip local policy route-map " command is not working at my router. i have shared the version as well kindly check.
=============================================================== Cisco IOS XE Software, Version 03.13.01.S - Extended Support Release Cisco IOS Software, ASR1000 Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.4(3)S1, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2014 by Cisco Systems, Inc.
If you make the changes that I suggest about advertising into BGP it should achieve your objective for inbound traffic from Internet to you. It should have 2 subnets come to you over ISP 1 while the other 2 subnets come to you over ISP 2. And if either ISP is not working then all traffic should use the ISP that is still working.
For outbound if you try maximum paths it will not achieve your objective. maximum paths will allow BGP to use both default routes. But nothing there will tell the first 2 subnets to use ISP 1 or tell the other 2 subnets to use ISP 2. To achieve that objective you need PBR.
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