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Cisco Bug: CSCuq12202 - Enable global TCP-MSS of 1250 bytes as default config

Last Modified

Oct 01, 2018

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

7.6(120.0)

Description (partial)

Symptom:
For CAPWAP encapsulated client data traffic, packets may be lost, or throughput may be degraded.

Conditions:
Seen with local mode APs (or FlexConnect centrally switched WLANs.)

TCP MSS adjust is not configured.

In some WAN or firewalled topologies, large or fragmented packets are discarded by the network, resulting in user data packets being lost over the CAPWAP tunnel (or EoIP tunnel, if anchored.)

Even with a path MTU of 1500 bytes between the AP and the WLC, the CAPWAP layer fragmentation will cause a
(usually minor) performance degradation.
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