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save y | Issue | Likely Cause | Solution | |-------|--------------|----------| | MTU change not applied | Missing commit command | Run commit in interface view | | Traffic still fragmented | Path MTU discovery (PMTUD) blackhole | Lower MTU further or enable ip mtu ignore-df (use carefully) | | SSH/VPN failing after change | MTU too high for encapsulation | Reduce MTU by 40–60 bytes | 7. Rollback Procedure To revert to default MTU (1500):

system-view interface gigabitethernet 0/0/1 mtu 1492 commit # Required on some Huawei VRP versions quit For Layer 3 VLAN interfaces:

interface tunnel 0/0/1 tunnel-protocol gre mtu 1476 commit 4.1 Check Interface Configuration display interface gigabitethernet 0/0/1 | include MTU Expected output: The Maximum Transmit Unit is 1492 4.2 Test with Ping (Do Not Fragment Flag) From a connected host or the router itself:

interface vlanif 10 mtu 1492 commit Tunnel MTU should be at least 24-28 bytes lower than physical MTU to accommodate encapsulation headers.

How To Change Mtu On Huawei Router ✓ 〈LATEST〉

End of Report

save y | Issue | Likely Cause | Solution | |-------|--------------|----------| | MTU change not applied | Missing commit command | Run commit in interface view | | Traffic still fragmented | Path MTU discovery (PMTUD) blackhole | Lower MTU further or enable ip mtu ignore-df (use carefully) | | SSH/VPN failing after change | MTU too high for encapsulation | Reduce MTU by 40–60 bytes | 7. Rollback Procedure To revert to default MTU (1500):

system-view interface gigabitethernet 0/0/1 mtu 1492 commit # Required on some Huawei VRP versions quit For Layer 3 VLAN interfaces:

interface tunnel 0/0/1 tunnel-protocol gre mtu 1476 commit 4.1 Check Interface Configuration display interface gigabitethernet 0/0/1 | include MTU Expected output: The Maximum Transmit Unit is 1492 4.2 Test with Ping (Do Not Fragment Flag) From a connected host or the router itself:

interface vlanif 10 mtu 1492 commit Tunnel MTU should be at least 24-28 bytes lower than physical MTU to accommodate encapsulation headers.

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