[f-nsp] MTU problem Brocade Chassis: MLXe 4-slot

[Jörg Kost]

Hi Adrian,

maybe I am late to the party, but seems your configuration works.

1510 + IP + ICMP => 1538 bytes
1511 + IP + ICMP + 3 bytes padding => 1542 (wont work)

Regards
Jörg

On 28 Feb 2017, at 12:50, Adrian Luchian wrote:

> Hi,
>
> We need to setup an L2 connection with MTU=1540 for a customer. After 
> changing default-max-frame-size to 2000 and issue reload, we still 
> can't get replies to icmp with size > 1500 bytes and df-bit set.
>
>
> 1510 Byte, DF not set = OK
> =================================
> hostname#ping x.x.x.x size 1510
> Type escape sequence to abort.
> Sending 5, 1510-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/8 ms
>
>
>
> 1511 Byte DF not set = not OK
> =================================
> hostname#ping x.x.x.x size 1511
> Type escape sequence to abort.
> Sending 5, 1511-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
> .....
> Success rate is 0 percent (0/5)
>
> 1500 Byte, DF set = OK
> =================================
> hostname#ping x.x.x.x size 1500 df-bit
> Type escape sequence to abort.
> Sending 5, 1500-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
> Packet sent with the DF bit set
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 4/6/8 ms
>
>
> 1501 Byte, DF set = not OK
> =================================
> hostname#ping x.x.x.x size 1501 df-bit
> Type escape sequence to abort.
> Sending 5, 1501-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
> Packet sent with the DF bit set
> .....
> Success rate is 0 percent (0/5)
>
>
> #show max-frame-size
> Default max frame size for ETH : 2000
> Default max frame size for POS : 4474
> Slot 1    Port   1  Port   2  Port   3  Port   4
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   5  Port   6  Port   7  Port   8
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   9  Port  10  Port  11  Port  12
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  13  Port  14  Port  15  Port  16
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  17  Port  18  Port  19  Port  20
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
> Slot 2    Port   1  Port   2  Port   3  Port   4
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   5  Port   6  Port   7  Port   8
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   9  Port  10  Port  11  Port  12
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  13  Port  14  Port  15  Port  16
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  17  Port  18  Port  19  Port  20
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
> Slot 3    Port   1  Port   2  Port   3  Port   4
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
> Slot 4    Port   1  Port   2  Port   3  Port   4
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   5  Port   6  Port   7  Port   8
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port   9  Port  10  Port  11  Port  12
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  13  Port  14  Port  15  Port  16
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>           Port  17  Port  18  Port  19  Port  20
>           --------  --------  --------  --------
>           2000      2000      2000      2000
>
>
> Is there anything else to be changed to accomplish this?
>
> Best regards,
>
> Adrian Luchian

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