Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 842)

818 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
53-1003031-02
6PE behavioral differences on the Brocade devices
9
6PE behavioral differences on the Brocade devices
The 6PE support provided on the Brocade MLXe series and Brocade NetIron XMR devices differs
from that provided on the Brocade NetIron CES and Brocade NetIron CER devices. The differences
are detailed in the following sections:
• Output statistics for the show mpls statistics 6pe command
• TTL propagation for 6PE packets
• CoS behavior for 6PE packets
Output statistics for the show mpls statistics 6pe command
The Brocade MLXe series and Brocade NetIron XMR devices can count both the Endpt Out-pkt and
Tnl Out-Pkt statistics, whereas the Brocade NetIron CES and Brocade NetIron CER devices can
count only the Endpt Out-pkt statistics due to hardware limitations.
TTL propagation for 6PE packets
The Time-to-Live (TTL) propagation for 6PE packets is controlled by the propagate-ttl and
label-propagate-ttl commands on the routers. By default, the propagate-ttl command is enabled
and the label-propagate-ttl command is disabled for the Brocade MLXe series and Brocade NetIron
XMR devices. Therefore, the user must enable the propagate-ttl and label-propagate-ttl commands
accordingly in order to configure TTL propagation for 6PE packets.
Table 161 describes the difference in the 6PE TTL propagation behavior between the Brocade
MLXe series and Brocade NetIron XMR devices, and the Brocade NetIron CES and Brocade NetIron
CER devices.
TABLE 161 Differences in the 6PE TTL propagation behavior on the Brocade devices
Behavior of Brocade MLXe series and Brocade NetIron
XMR devices Behavior of Brocade NetIron CES and Brocade NetIron CER
devices
The TTL propagation for 6PE packets is controlled by
the propagate-ttl command on the ingress and egress
6PE routers, and by the label-propagate-ttl command
on the transit and the Penultimate Hop Popping (PHP)
routers. The TTL propagation for 6PE packets is controlled only by
the propagate-ttl command on the ingress 6PE, egress
6PE, transit, and PHP routers. The label-propagate-ttl
command is not applicable for the Brocade NetIron CES
and Brocade NetIron CER devices.
Due to design limitations, when the propagate-ttl
command is enabled on the PHP router, the TTL value is
not decremented and therefore the recorded TTL value at
the endpoint is one more than the expected value.
CoS behavior for 6PE packets
Table 162 describes the Class of Service (CoS) treatment for 6PE packets at the ingress 6PE,
egress 6PE, transit, and PHP routers, and the differences in the CoS behavior between the Brocade
MLXe series and Brocade NetIron XMR devices, and the Brocade NetIron CES and Brocade NetIron
CER devices.