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Beginner

Can't ping with size more than 600 to any servers

Hello.

I have two Nexus 3k connected to servers, I configured VPC on both nexus and can access internal network.

The Issue wthere when i try to ing any server with size more than 600 it gave me request time out.

 

Appreciate your feedback.

 

Thank you

2 REPLIES 2
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VIP Advisor

Re: Can't ping with size more than 600 to any servers

Provide more information and environment, from what IP address source and what is the destination IP.

 

how is your network topology in terms of reachability from A to B ( A is source and B is destination).

BB
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Cisco Employee

Re: Can't ping with size more than 600 to any servers

Hello,

 

Fundamentals,

L2
==
N5K1(MTU 9000)(et1/3)----------(et3/3)(mtu 9000) N7K-SW1 (mtu 1500)(et3/1) ------- (et3/1)(mtu 1500) N7K-SW2 (mtu 1500)3/4--------(et1/4)N5K2(MTU 9000)

1. First I have initoiated the Normal ping and it was succssefull with out any ping drop.
2. I have initiated the ping with the 5000 byte with packet count 50 from N5k1 to NK2 . I was not able to ping because of transperent L2 path (In transit MTU Configured less than 5000)
3. Lets say 50 ping initiated on N7K-SW1 interface 3/1, you will see Jumbo frames increases, On N7K-Sw2 E3/1 Exact 50 input error and 50 Giants packets are seeingin the RX counter.

If Links are L3

Sw1--MTU9216------MTU1500-SW2

Lets say you ping with 1540 Byte, in this case it will add IP-header of 20 Bytes and 8 Bytes of ICMP which is equal to 1568, where you will fragmentation.

If ping 1541 Byte Load, which makes it to 1569, you will packet getting dropped.

 

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Thanks,

Shivakumar

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