Initiating Upstream Proxy request on Cache-Miss (ACNS)

[muvavarirwar]

1. Client has two (2) tier Content Routing network architecture:

Client<->Tier_2_CE <-> Tier_1_CE <-> Origin_Server_01

2. Client does not have EXPLICIT PROXY configured on browser pointing to Tier_2_CE

3. Network uses Content Routing to redirect client requests to appropriate Tier_2_CE (proximity search using CZF, channel assignment)

4. SCENARIO_PRE-POSITIONED: (WORKS FINE)

4.1 Client requests PRE-POSITIONED content from CDN

4.2 Client request redirected to Tier_2_CE

4.3 Tier_2_CE services request from PRE-POSITINED content (i.e. cache-hit)

5. SCENARIO_NONE-PRE-POSITIONED:

5.1 Tier_2_CE configured with outgoing HTTP proxy pointing to Tier_1_CE:

"http proxy outgoing host X.Y.Z.W 8080 primary"

5.2 Tier_1_CE configured with inbound HTTP proxy

"http proxy incoming 8080"

5.3 Tier_1_CE configured with outgoing HTTP proxy pointing to Origin Server:

"http proxy outgoing host A.B.C.D 80 primary"

5.4 ISSUE

5.4.1 Client request for NONE-PREPOSITIONED content reaches appropriate Tier_2_CE

5.4.2 Tier_2_CE does not make Upstream request for content on Cache_MISS

6. QUESTIONS

6.1 Can you point me to reference documentation around proxy configuration (environments not using (a) WCCP (b) explicit proxy configuration)

6.2 Provide some configuration guidance/samples around this scenario

regards,

[mchin345]

You could refer to the following webpage for information on how to configure proxy in a ACNS environment.

http://www.cisco.com/en/US/products/sw/conntsw/ps491/products_configuration_guide_chapter09186a0080081220.html

This webpage gives detailed information on ACNS and all the necessary configurations.

[muvavarirwar]

Thanks Mary,

It appears as if the configurations that are outlined on that page either

(1) assume that the subscriber / client has

EXPLICITLY configured a proxy server in their browser that points to their Tier-2/edge CE farm or

(2) the access infrastructure into the CDN (essentially edge routers) are configured with WCCP

Let me know if this is not the case, as I may be mis-reading & mis-configuring.

In my setup, the Tier-2/edge CE's are configured to

(3) listen for inbound requests on (80, 8080) and

(4) point to an upstream proxy A.B.C.D:8080

ISSUE

(5) In normal operating conditions (i.e. content IS pre-positioned), client requests are fully serviced from CDNFS on the Tier-2/edge CE's

(6) When content is not available on CDNFS (none-prepositioned), a cache miss occurs on the Tier-2/edge CE's.

(7) What is the best way to configure my Tier-2/edge CE's so that they ALWAYS query upstream proxy for content in the event of a CACHE-MISS on local CDNFS?

(8) How do I enable this ((7) above) without having to use rules on the Tier-2/edge CE's?

Thanks again,

regards,