• MPLS Label Switching and Packet Forwarding Overview on page 218
• MPLS Forwarding and Next-Hop Tables Overview on page 233
• MPLS Interfaces and Interface Stacking Overview on page 236
• Topology-Driven LSPs Overview on page 255
• MPLS Packet Spoof Checking Overview on page 234
• Statistics for IP Packets Moving On or Off MPLS LSPs on page 231
Statistics for IP Packets Moving On or Off MPLS LSPs
In the earlier architecture, the statistics for IP packets moving onto or off an LSP applied
to the IP interface that was stacked on top of the LSP. Because IP interfaces are no longer
stacked on LSPs in the current architecture, these statistics apply to one of the dynamic
IP interfaces that is established on the same major interface the the LSP is stacked on.
However, even though the IP traffic leaving the LSP as MPLS packets is associated with
a dynamic IP interface, it does not use the queue associated with that dynamic IP interface.
Instead, the IP traffic uses the queues at the layer 2 interface; the MPLS major interface
on which the dynamic IP interface is created does not have its own queue. As a result,
queue-related statistics do not increase with the IP traffic flow on the dynamic IP
interfaces. This behavior can create some confusion when you examine the output from
commands such as show egress-queue rate interface ip.
In the following sample output, the statistics of interest are those for the layer 2 interface,
atm-vc ATM9/0.10. Traffic is present as indicated by the forwarded rate value for the
layer 2 interface. If no IP traffic is present, the forwarded rate for the layer 2 interface has
a value of 0.
host1:pe1# show egress-queue rates interface atm9/0.10
traffic forwarded aggregate minimum maximum
interface class rate drop rate rate rate
--------------------------- ----------- --------- --------- ------- ---------
atm-vc ATM9/0.10 best-effort 116032 0 4680000 149760000
ip ATM9/0.10 best-effort 0 0 4680000 149760000
ip ip19000001.mpls.ip best-effort 0 0 4680000 149760000
ipv6 ipv619000001.mpls.ipv6 best-effort 0 0 4680000 149760000
Queues reported: 4
Queues filtered (under threshold): 0
* Queues disabled (no rate period): 0
**Queues disabled (no resources): 0
Total queues: 4
You can use the show mpls interface brief command to display the MPLS major
interfaces. You can then view the statistics for the major interface displayed by the show
ip interface command, as show in the following display excerpt:
host1:pe1# show ip interface
null0 line protocol is up, ip is up
...
loopback0 line protocol is up, ip is up
...
ATM9/0.10 line protocol Atm1483 is up, ip is up
...
231Copyright © 2010, Juniper Networks, Inc.
Chapter 3: MPLS Overview
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