QoS Policies
50 Quality of Service Guide
FC Mapping Based on EXP Bits at VLL/VPLS SAP
Figure 5: Example Configuration — Carrier’s Carrier Application
To accommodate backbone ISPs who want to provide VPLS/VLL to small ISPs as a site-to-
site inter-connection service, small ISP routers can connect to Ethernet Layer 2 SAPs. The
traffic will be encapsulated in a VLL/VPLS SDP. These small ISP routers are typically PE
router. In order to provide appropriate QoS, the SR-Series router support a new classification
option that based on received MPLS EXP bits.
The lsp-exp command is will be supported in sap-ingress qos policy. This option can only be
applied on Ethernet Layer 2 SAPs.
VPLS/VLL
MPLS LSP
7x50-2
PE-BPE-B
Backbone
Provider
BB-Link-Header
BB-Tunnel-Label
BB-Svc-Label
ISP-Ether-Header
ISP-Tunnel-Label
ISP-Svc-Label
ISP-Payload
ISP-1
Site A
ISP-1
Site B
7x50-1
OSSG257
ISP-Ether-Header
ISP-Tunnel-Label
ISP-Svc-Label
ISP-Payload
ISP-Ether-Header
ISP-Tunnel-Label
ISP-Svc-Label
ISP-Payload
Table 9: Forwarding Class Classification Based on Rule Type
# Rule Forwarding Class Comments
1 default-fc Set the policy’s default forwarding
class.
All packets match the default rule.
2 IP criteria:
• Multiple entries per
policy
• Multiple criteria per
entry
Set when an fc-name exists in the
entry’s action. Otherwise, preserve
from the previous match.
When IP criteria is specified,
entries are matched based on
ascending order until first match
and then processing stops. A
packet can only match a single IP
criteria entry.
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