Filter Policies
Router Configuration Guide 501
Figure 23: ACL filter modeling for ESM Service Chaining
Figure 24 shows upstream VAS service chaining steering using filter policies. Upstream
subscriber traffic entering Res-GW is subject to the subscriber's ingress ACL filter assigned
to that subscriber by a policy server. If the ACL contains VAS steering rules, the VAS-rule-
matching subscriber traffic is steered for VAS processing over a dedicated to-from-access
VAS interface in the same or a different routing instance. After the VAS processing, the
upstream traffic can be returned to Res-GW by a to-from-network interface (shown in
Figure 24) or can be injected to WAN to be routed towards the final destination (not shown).
al_0703
ACL for Service Gold
ip(v6)-filter “ACL Gold”
•••
# VSD service chaining
embed-filter “Gold VAS” offset 1001
ACL for Service Gold
ip(v6)-filter “ACL Gold”
•••
# VSD service chaining
embed-filter “VAS 1” offset 1001
embed-filter “VAS 2” offset 1101
embed-filter “VAS 3” offset 1201
ACL for Service Silver
ip(v6)-filter “ACL Silver”
•••
# VSD service chaining
embed-filter “VAS 1” offset 1001
embed-filter “VAS 3” offset 1201
ACL for Service Silver
ip(v6)-filter “ACL Silver”
•••
# VSD service chaining
embed-filter “Silver VAS” offset 1001
Filter per service tier, common service
chains (match and action) configured
multiple in each service tier filter.
Filter per each service chain, subscriber tier
build by including multiple VAS service filters.
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