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C H A P T E R 18 Server Load Balancing (SLB)
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Precedence of Flow Redirection Rules
Multiple flow redirection rules can overlap in making a redirection
decision. In these cases, precedence is determined by "best match"
where the most specific redirection rule that satisfies the criteria
will win. The best match is determined in this order:
• Destination IP Address/Mask
• Destination IP Port
• Source IP Address/Mask
In general, these rules apply:
• If a flow with a comparatively better matching mask on an IP
address satisfies the content of a packet, that flow is observed.
• If one flow redirection rule contains
any as an L4 protocol and a
second flow redirection rule contains explicit L4 port information,
the second is observed, if the packet contains matching L4
information.
• If one flow has a comparatively better match on source
information and a second flow has comparatively better match on
destination information then the rule with the better match on the
destination information is selected.
For example, in the following two cases, the rule with the best
match is the rule that is selected.
Table 18.5: Example #1: Flow Redirection Rules
Destination IP
Address
Destination IP
Port
Source IP
Address
Priority
Selection
192.0.0.0/8 80 ANY 1
192.168.0.0/16 ANY ANY 2