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Cisco Bug: CSCvs13977 - C9500H input queue wedge from ipv6 dhcp server configuration on SVI w/o global dhcp pool

Last Modified

Aug 25, 2020

Products (35)

  • Cisco IOS
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst C9500-40X-A Switch
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Known Affected Releases


Description (partial)

The input queue of the SVi gets wedged at 376/375 when the switch gets DHCPv6 solicit packets sent through the Vlan.

C9500H(config-if)#do show int vlan 101 | in nput q
  Input queue: 376/375/8165/0 (size/max/drops/flushes); Total output drops: 0

This is seen when ipv6 dhcp server <name> is configured on the SVI

interface Vlan101
 ipv6 dhcp server <name>   <--- ipv6 dhcp server configured on SVI
No dhcp pool is configured globally
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