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

[Adrian Luchian]

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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