Interfaces and Hardware Component Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases
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Interfaces and Hardware Component Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases
Updated: July 31, 2026
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This topic describes how a subinterface on the Cisco 8000 Series Router inherits its maximum transmission unit (MTU) from the parent physical interface, with an additional four bytes allowed for the 802.1Q VLAN tag.
The system inherits the subinterface maximum transmission unit (MTU) from the physical interface with an additional four bytes allowed for the 802.1Q VLAN tag.
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