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Cisco Bug: CSCtb49959 - CAT3750E: uRPF causes High CPU with no failure streams

Last Modified

Feb 14, 2018

Products (96)

  • Cisco Catalyst 3560 Series Switches
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560-12PC-S Compact Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 2960-24-S Switch
  • Cisco Catalyst 3750G-12S Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 2960G-24TC-L Switch
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Known Affected Releases

12.2(50)SE3

Description (partial)

Symptom:
high cpu seen in process 'HACL Queue Process' up to 50-70%.


Conditions:
on 3750E and 3560E,
when someone is using any type of uRPF under an SVI, with a ACL inlcuding log-keyword:

e.g.:
interface VlanXX
...
 ip verify unicast reverse-path 199
or
 ip verify unicast source reachable-via rx allow-self-ping 119
...

3750#sh ip access-list 199
Extended IP access list 199
    10 deny ip any any log
3750#

even without having matches for that ACL, or with no failure streams
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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