When the EXP value changes within the MPLS cloud, the top label is
changed. When the entire labelstack is removed from the packet, than
yes the EXP value is then copied back to the IP header.
If the top label is changed you might be lucky that your VPN label
hasn't changed and the EXP value isn't changed :-)
--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer – IPexpert, Inc.
URL: http://www.IPexpert.com
On 1 okt 2009, at 09:57, Sebastian Shumari wrote:
Hi all,
one question about QoS:
Cisco IOS copies the three most significant bits fo the DSCP or IP
precedence of the IP header to the EXP field at the edge of the
network. The service provider set an MPLS packet QoS to a different
value. What will happend when this packet leave the MPLS cloud? I
wonder if the MPLS QoS value will copy again to the IP header.
Thanks in advance
Regards
Sebastian Shumari
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_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
