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Routing loop with exponential packet growth

Question asked by Kaspars Zibarts on Oct 9, 2017
Latest reply on Oct 10, 2017 by Timothy Hall

Just wondering if anyone else has seen this with chassis running VSX (R76SP30). Some of our WAN sites complained of occasional slowness which we managed to drill down to "packet storms". When we looked at the actual traffic it was silly routing loop between FW and MPLS router. (Not that) funny part is that even though IP TTL is correctly reduced by both nodes, firewall doubles number of packets in response in each cycle! So it it goes 1 - 2 - 4 - 8 etc. 

We started off with TTL 123 so it generate insane amount of packets (2^123...)

Has anyone seen anything like it? 

SR on it's way but would be good to know if we can avoid this somehow.

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