Hello,
I have a weird routing issue where my MX80 is not doing what it is supposed to
do. I have a customer configured with BGP announcing two subnets to me. The
subnets end up in the routing table. One subnet works fine, the other routes
to the wrong machine in my network. Everything looks correct when I 'show
route a.b.c.d' but traceroute goes to the wrong machine creating a routing loop.
Is it possible for the FIB to contain different information than what's in
'show route'?
How do I look at whats in the FIB?
How do I reset the FIB and resync it with the actual routes?
show route A.B.C.0 detail
inet.0: 439841 destinations, 876907 routes (439825 active, 0 holddown, 32
hidden)
Restart Complete
A.B.C.0/24 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Indirect
Address: 0xdeadbeef
Next-hop reference count: 6
Source: X.Y.Z.11
Next hop type: Router, Next hop index: 1048574
Next hop: Q.W.E.195 via ge-1/1/1.0
Next hop: X.Y.Z.11 via ge-1/1/2.0, selected
Protocol next hop: T.U.V.122
Indirect next hop: 160865a0 1048575
State: <Active Int Ext>
Local AS: 1111 Peer AS: 1111
Age: 13:39 Metric: 0 Metric2: 20
Task: BGP_1111.X.Y.Z.11+12834
Announcement bits (3): 0-KRT 4-BGP RT Background 5-Resolve tree
1
AS path: 22222 I
Accepted
Localpref: 100
Router ID: M.N.O.169
The routing table clearly shows two paths X.Y.Z.11 & Q.W.E.195
trace route shows the packets going to X.Y.Z.13 which sends it back to the MX80
and we get a happy routing loop.
The other subnet from the customer looks the same in the show route detail but
it gets routed correctly to X.Y.Z.11 and everything is working.
--
Matthew S. Crocker
President
Crocker Communications, Inc.
PO BOX 710
Greenfield, MA 01302-0710
E: [email protected]
P: (413) 746-2760
F: (413) 746-3704
W: http://www.crocker.com
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