Posted on September 29, 2020 6:11 am
 |  Asked by noc
 |  53 views
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Hello,

can anyone help me that how cani adjust tcp mss on 7050s ?

i read the documents but it seems tcp mss ceiling is not availble in 7050s , is there nay other way ?

thanks,

1
Answered on September 29, 2020 6:20 am

Hi Noc,

Thanks for reaching out.

As per TOI  https://eos.arista.com/eos-4-23-2f/mss-clamping/ ,TCP MSS Clamping feature is not supported on 7050S model.

Lab Testings on 7050s platforms also confirmed the same.

Also I was unable to find an option to manipulate the DF bit on EOS either using Route-maps or using Policy-Maps.

You can reach out to your Arista Accounts team so that they can guide you regarding alternate options(if available)/for further suggestions.

Thanks,

Bhavana.

0
Posted by Alexis Dacquay
Answered on September 29, 2020 11:26 am

Hi,
Is that for control-plane traffic originated by the switch (for example BGP, etc)?
Or for traffic transiting the switch or router?

Can you just change the Layer3 interface MTU?
By default the L3 interfaces have an MTU of 1500. It is recommended to increase the L3 MTU to the maximum possible (depending on your environment's requirements and limitations)
Layer2 interfaces alway have the MTU to the maximum (Jumbo frame size)

Example:

arista(config-if-Et1)#sh int e1
Ethernet1 is administratively down, line protocol is down (disabled)
Hardware is Ethernet, address is 001c.731e.e5ef (bia 001c.731e.e5ef)
Ethernet MTU 9214 bytes , BW 10000000 kbit

arista(config-if-Et1)#no sw
arista(config-if-Et1)#no shut
arista(config-if-Et1)#sh int e1
Ethernet1 is down, line protocol is down (notconnect)
Hardware is Ethernet, address is 001c.731e.e5ee
IP MTU 1500 bytes , BW 10000000 kbit

arista(config-if-Et1)#mtu 9200
arista(config-if-Et1)#sh int e1
Ethernet1 is down, line protocol is down (notconnect)
Hardware is Ethernet, address is 001c.731e.e5ee
IP MTU 9200 bytes , BW 10000000 kbit

arista(config-if-Et1)#

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