The two routes seem to have all the same base criteria and it is simply selecting the oldest one in the table right now.
If you want to insure that one of the routes is always preferred then you would need to adjust the import policy on one of the peers. Typically either lowering or raising the local preference value by that peer as needed. This would insure the routes are used in the desired order at all times.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
http://puluka.com/home------------------------------
Original Message:
Sent: 07-23-2022 21:31
From: Unknown User
Subject: BGP route selection question
If the routing table has a prefix learned from bpg neighbor and via instance-import, the bgp selection rules are still the same.
Any possibility for the following next-hop selected (192.168.0.45) to switch to 192.168.0.57 ?
run show route table CE2-1.inet.0 192.168.0.88/30 extensive CE2-1.inet.0: 41 destinations, 55 routes (41 active, 0 holddown, 0 hidden)192.168.0.88/30 (2 entries, 1 announced)TSI:KRT in-kernel 192.168.0.88/30 -> {192.168.0.45}Page 0 idx 1, (group ebgp type External) Type 1 val 0xdca4834 (adv_entry) Advertised metrics: Nexthop: Self AS path: [64600] 54591 I Communities: target:54591:201Path 192.168.0.88 from 192.168.0.45 Vector len 4. Val: 1 *BGP Preference: 170/-101 Next hop type: Router, Next hop index: 1559 Address: 0xdee8bf0 Next-hop reference count: 41 Source: 192.168.0.45 Next hop: 192.168.0.45 via ge-0/0/0.312, selected Session Id: 0x1ad State: <Active Ext> Local AS: 64600 Peer AS: 54591 Age: 1:15:09 Validation State: unverified Task: BGP_54591_64600.192.168.0.45 Announcement bits (3): 1-KRT 2-rt-export 3-BGP_RT_Background AS path: 54591 I Communities: target:54591:201 Accepted Localpref: 100 Router ID: 172.30.5.10 BGP Preference: 170/-101 Next hop type: Router, Next hop index: 1571 Address: 0xeb08830 Next-hop reference count: 44 Source: 192.168.0.57 Next hop: 192.168.0.57 via ge-0/0/0.315, selected Session Id: 0x1bf State: <Secondary NotBest Ext> Inactive reason: Not Best in its group - Active preferred Local AS: 64600 Peer AS: 54591 Age: 5:37 Validation State: unverified Task: BGP_54591_64600.192.168.0.57 AS path: 54591 I Communities: target:54591:201 Accepted Localpref: 100 Router ID: 172.30.5.14 Primary Routing Table CE2-2.inet.0[edit]
thanks a lot !!