See juniper interface MTU is set to max 16000 bytes. but when I ping I can
only get 9584 bytes through to the other side of the link.  This mx960 is
linked to another mx960, but Ciena 6500 dwdm is in between the mx960's.


Is there any reason why I should be concerned that currently Ciena tells us
that they only support 9600 byte MTU and that I have 16000 set on my MX960's


Is there an issue that could arise with this scenario ?


Currently ospf and ldp are neighboring fine and advertising routes and


Ciena TAC mentioned that future upgrades may enable larger mtu's.


agould@960> show arp interface ae0.0

MAC Address       Address         Name                      Interface

d0:07:ca:zz:yy:xx             ae0.0


agould@960> show configuration interfaces ae0 | display set

set interfaces ae0 mtu 16000

set interfaces ae0 aggregated-ether-options lacp active

set interfaces ae0 unit 0 family inet address

set interfaces ae0 unit 0 family mpls


agould@960> show interfaces ae0.0 | grep mtu

    Protocol inet, MTU: 15986

    Protocol mpls, MTU: 15974, Maximum labels: 3

    Protocol multiservice, MTU: Unlimited


agould@960> show lacp interfaces ae0

Aggregated interface: ae0


      et-0/0/2                  Current   Fast periodic Collecting


agould@960> show interfaces et-0/0/2 | grep mtu

  Link-level type: Ethernet, MTU: 16000, MRU: 16008, Speed: 100Gbps, BPDU
Error: None, Loop Detect PDU Error: None,


agould@960> ping rapid size 9584

PING ( 9584 data bytes


--- ping statistics ---

5 packets transmitted, 5 packets received, 0% packet loss

round-trip min/avg/max/stddev = 3.169/3.622/4.646/0.524 ms


agould@960> ping rapid size 9585

PING ( 9585 data bytes


--- ping statistics ---

5 packets transmitted, 0 packets received, 100% packet loss


- Aaron



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