LOSS OF PACKAGES BETWEEN ASR 9006 AND FORTINET 3600C

[emendez1816]

Good afternoon, I have the following problem, I have an ASR 9006 as a core router + fortinet 3600C firewall, they are connected with an interface of 10Gbps with MTU of 1500, when I perform a ping I always lose 1 ping although these are directly connected, it does not exist problem in the network interfaces, but when I ping with mtu over 1514 I have no packet loss, someone could guide me where the problem could be.

[Julio E. Moisa]

Hi

In this link you could find the answer:

https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-xr-software/116350-trouble-ios-xr-mtu-00.html

In the classical Cisco IOS software (not the Cisco IOS XR software), the interface mtu command configures the L2 payload size, but does not include the L2 header. This is different from the Cisco IOS XR software which includes both the L2 and L3 overhead in the interface mtu command. The L3 MTU commands, as in the case of the ipv4 mtu command, configure the maximum packet size of that protocol which includes the L3 header. This is similar to the case of Cisco IOS XR software.

Regards. 

[Hilda Arteaga]

Hi @Julio E. Moisa thanks for assisting to clarify this inquiry 

Dear @emendez1816 thanks for contacting the community, we hope you find the information useful. 

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