We had a network running SAP over it with IPsec. There was
no troubles with it until we migrated it to MPLS.
Now, while we have not changed SAP configuration, it is
disconnecting from the server randomly on all sites.
We have tried implementing rate-limit to see if there was
some bandwidth issues, but we have confirmed that all links
are running solid and smooth.
However, we can not figured out if a MPLS with Cisco Systems
may have some Issues with SAP traffic. SAP server has not
any timeout configured on it. Also we have reduced the MTU
on all devices to discard package loses ( we saw that some
sites were producing fragmented traffic, and now it's
It just happens with SAP connections, all the lines have not
got any cut on this past days.
Has anyone seen an issue with SAP and MPLS VPN:ng networks
Could you tell me whats the MTU size used by the sp server. This can be the issue only with mtu.
actually what happens if the core is supporting MTU of 1500 bytes then customer cannot send the data more than 1478 or 1774(if dot1q is using) data. 20 bytes of ip header + 4 bytes of vpnv4 label + 4 bytes of igp label + 4 bytes of dot1q if used.
In MPLS env. fragmentation is not possible.
Fragmetantion was doing for IP protocol.
Now, we have configured 1430 MTU ( Under 1474).
yes, fragmentation always occurs in ip protocol, thats why if you l2tpv3 fragmentation works but in case of encapsulation mpls it doesn't.
The problem is not only with SAP service, it happens with all services ( Email). It's more frequently when the user don't use the service for few minutes 3 or 4 ( Timeout). SAP error is "Connection reset by peer".
I have changed the firewall ( Netscreen 25) before the SAP server. This firewall is on the central site. I have installed Zywall 5.
The connection with SAP is working perfectly. I will investigate because SAP connection does not work properly with Netscreen.