Release notes - H3C S9500-CMW310-R1652P03

Hangzhou H3C Technologies Co., Ltd.
H3C S9500-CMW310-R1652P03
Release Notes
2010-9-27 Page 11 of 56
4. Limitation 4
【QOS】In MPLS L3VPN networking, the IP packets, which come from the Egress
PE (i.e. the packets with the MPLS tag header removed), cannot map the DSCP
value of the IP packet according to EXP value of the MPLS header. Instead, they
adopt the DSCP value of the original IP packet. It is suggested that the DSCP value
of the IP packet be guaranteed by the initiator.
5. Limitation 5
【QOS】In MPLS L3VPN networking, for the non-TCP and non-UDP IP packets, the
EXP value can be set according to the mapping table from DSCP to EXP on the
Ingress PE. However, for the TCP and UDP packets, the EXP value only can be
directly mapped according to the three low bits of DSCP, instead of according to the
three high bits of DSCP.
6. Limitation 6
【QOS】After the drop priority (DP) is remarked based on the customized DSCP
mapping in traffic-priority or remark-policed-service, the packets entering the same
queue (except queue 2) are not dropped by the set DP.
7. Limitation 7
【 QOS 】 The boards with suffixes CA/CB/DB/DC only provide the parameter
mapping of User Priority of Traffic Class+Confrom-Level->COS, while the DSCP
value in the mapping table is a default one. For this reason, after remarking the COS
of the packet, the DSCP value of the packet is modified as well.
8. Limitation 8
【QOS】On the same port, traffic shaping and WRR (Weighted Round Robin) cannot
be enabled simultaneously, or the WRR queue dispatching mode will not function.
9. Limitation 9
【QOS】Flow control and QoS functions cannot be enabled on a port at the same
time. Otherwise, after flow control is enabled on a port, there will be no guarantee for
preferential processing of the queues with high priorities, resulting in QoS failure.
10. Limitation 10
【QOS】The 100Base port can only dispatch 5 queues at one time. If it is required to
send packets from over 5 queues, please use the WRR (Weighted Round Robin)
mode.