Configuration
Parameter |
Details |
Recommended
Value |
HTTP Listening port |
This is the port that IWSVA listens
on to receive connections. |
8080 |
Router IP address |
Detail which router or switch to communicate
with via WCCP |
Type in the router or switch IP address |
Password |
Password for WCCP authentication |
Type in the password for the WCCP
authentication |
Auto-negotiate |
Provides automatic negotiation of
the forwarding method and the assignment method. |
Select Enable
(default.) |
Note:
If you select Enable,
the Forwarding and Assignment Methods parameters are grayed
out since they are automatically configured. After the Deployment
Wizard finishes, you can see the values of the auto-negotiated
parameters at: Administration
> Network Configuration > WCCP.
- If the route supports L2/GRE as a forwarding method, IWSVA
should select L2 when the router and IWSVA are in the same
network segment. (This takes performance into account.)
- If one route supports L2/GRE as forwarding method, IWSVA
should select GRE when the router and IWSVA are not
in the same network segment.
-If one route supports HASH/MASK as assignment method, IWSVA
should select MASK. (This takes performance into account.) |
WCCP forwarding method |
The WCCP forwarding method determines
how intercepted traffic is transmitted from the WCCP server (IOS)
to the WCCP client. |
Select the Generic Routing Encapsulation
(GRE) or Layer 2 (L2) for WCCP forwarding method. GRE is the default. |
Note:
GRE forwarding, which is
the default forwarding method, encapsulates the intercepted
packet in an IP GRE header with a source IP address of the
WCCP server (IOS) and a destination IP address of the target
WCCP client. This has the effect of a tunnel, allowing the
WCCP server (IOS) to be a multiple Layer 3 hops away from
the WCCP client. L2 forwarding simply rewrites
the destination MAC address of the intercepted packet to equal
the MAC address of the target WCCP client. L2 forwarding requires
that the WCCP server (IOS) is Layer 2 adjacent to the WCCP
client |
Assignment method |
WCCP provides packet distribution
through two algorithms, Hash and Mask |
Select Hash tables or Mask/value sets
as the WCCP assignment method. Mask is the default |
Note:
With
the hash assignment, the router runs a value in the header
of the packet it is redirecting through a hashing function. With mask assignment, each
router/switch in the service group has a table of masks and
values that it uses to distribute traffic across the proxy
appliances in the service group. |
Service Group |
Standard or Dynamic |
Standard—Well-known services, also referred
to as static or standard services, have a fixed set of characteristics
that are known by both IOS and WCCPv2 client devices. Dynamic—Dynamic services are initially
only known to the WCCPv2 clients within the service group. |
Note:
For example, a single well-known (standard) service called
web-cache has a Service ID is 0. This service redirects all
TCP traffic with a destination port of 80.
The characteristics of a dynamic service are initially only
known to the WCCPv2 clients within the service group. The
characteristics of the service group are communicated to the
IOS devices by the first WCCPv2 client device to join the
service group. |
Unique Service ID |
Identifies service groups
Defaults:
Standard service =0 Dynamic service =80 |
Range
Standard
= 0-50 Dynamic
= 51-255 |
