Release Notes

Login delay
● Wh
en logging into a switch, it may take 6 to 10 seconds for the CLI prompt to display.
MTU
● After upgrading to 10.5.1.6 in Full Switch mode, the MTU defaults to 9216 on all VLANs and Ethernet Interfaces which do not
already have a user configured MTU.
Obscure password
● Obscure password (service obscure-password) is enabled by default when upgrading to 10.5.1.6 if the setting is left
untouched before upgrade.
● If obscure password configuration is explicitly disabled before upgrade, it remains in disabled state after upgrade.
Source MAC address handling
● Learning of source MAC address from received LLDP and LACP packets is disabled.
VLAN scale
● If the number of configured VLANs is more than 500, it is recommended to have IGMP/MLD snooping enabled only on the
required VLANs and do not exceed a maximum count of 500 enabled VLANs. Alternatively, disable IGMP/MLD snooping
globally.
NOTE: IGMP/MLD snooping is disabled by default in MX-Series SFS mode but is enabled in Full Switch mode. Please
s
ee the Dell EMC SmartFabric OS10 User Guide for more information.
Resolved issues in 10.5.2.6
Th
e following high severity issues have been resolved in this release.
Issue ID Functional Area Description
AR-39573 VLT User configured cluster s
e
curity-
profile does not take effect after
upgrading the operating system and
this impacts VLT and DNV cluster
convergence with peers that use the
same security-profile.
AR-39599 Security Updated the old default X.509v3
c
e
rtificate with a new X.509v3 default
certificate.
AR-39739 LACP In certain scenarios, LACP port channel
interfaces remain inactive when there is
a flap on the interface.
AR-39777 VLT VLT fails to converge after installing a
custom SSL certificate.
AR-39802 Common vulnerabilities and exposures
(CVEs)
The following CVEs have been
addressed:
● CVE-2021-23840
● CVE-2021-23841
● CVE-2021-23839.
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