[c-nsp] MTU Issues

[Mohammad Khalil]

hi

i have a device generating traffic connected to Cisco 7606-S via port channel
the device interfaces configured with MTU 1400 and tcp mss enabled on
the configuration from Cisco side is as below (i have port channel contains 5 physical G interfaces and assigned to SVI)
CR1.KJ-Building#sh etherchannel 10 summary
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 4
Number of aggregators:           4

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
10     Po10(SU)         -        Gi3/3(P)    Gi3/11(P)   Gi3/19(P)  
                                 Gi3/27(P)   Gi3/35(P)  

Last applied Hash Distribution Algorithm: Fixed

CR1.KJ-Building#sh run int port-channel 10
Building configuration...

Current configuration : 259 bytes
!
interface Port-channel10
 description CORE_VLAN to ASN Gateway
 switchport
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport mode access
 load-interval 30
 speed 1000
 duplex full
 flowcontrol receive on
 flowcontrol send on
end


interface Vlan10
 description CORE VLAN
 ip address 10.40.2.2 255.255.255.240
 ip access-group WiMAX_Users_firewall in
 no ip redirects
 no ip unreachables
 load-interval 30
 standby 10 ip 10.40.2.1
 standby 10 priority 110
 standby 10 preempt
 standby 10 name CORE_VLAN_HSRP
 hold-queue 2000 in
end

interface GigabitEthernet3/3
 description ASN LBPA0 C6 P5 (Po10) (CORE_VLAN)
 switchport
 switchport access vlan 10
 switchport mode access
 no logging event link-status
 load-interval 30
 speed 1000
 duplex full
 flowcontrol receive on
 flowcontrol send on
 channel-group 10 mode on
end