i am working in isp. i had given a 5mb link to customer and customer end its juniper router j6350. bgp is running in his router , and they have their own AS number and ip blocks. so we r just advertising their ip block and AS via my upstream. meanwhile i had configured my cisco router to advertise only the default route to their end. This ebgp link is up and the bgp state is showing me established. but when i give sh route command in juniper router my default route is not reflecting , when i give sh route 0.0.0.0 all , my advertised default route is showing me as unusable.
my set up is as follows
juniper(customer end)------> cisco my L3 switch ------> cisco(my Gw router)
cisco L3 conf:
just a default route for thier ip block pointing towards the nexthop as juniper end ip. L3 ospf is running and static routes are redistributed into ospf
my Gw conf:
router bgp 1880
neighbor 61.x.x.18 remote-as 4540
neighbor 61.x.x.18 description BMS
neighbor 61.x.x.18 ebgp-multihop 255
neighbor 61.x.x.18 update-source Loopback5
neighbor 61.x.x.18 version 4
neighbor 61.x.x.18 default-originate
neighbor 61.x.x.18 soft-reconfiguration inbound
neighbor 61.x.x.18 prefix-list bms in
neighbor 61.x.x.18 route-map bms-out out
and in the prefix list bms in
i allowed their ip blocks and deny remaining and in route map bms-out i had
If the BGP in Established state, then the nexthop should be reachable.
Here is the syntax in Juniper:
check with: (Sh route protocols bgp). you should get all Networks advertised by Cisco router UNLESS you have policy dening it at Juniper.
Your config on Cisco router looks fine, make sure you dont have filtering policies at the Juniper J series. Please also post configuration in Juniper if the problem still not rectified.
The BGP Dampening rule has no affect on the current problem, Juniper has different Default dampening parameters than Cisco (default dampening parameters). even if its not configured in Cisco, the Juniper router shall suspend Networks if the penalty points reached 2000 by default.
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