Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 92
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80 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Traffic Distribution based on Cache Server Capacity
2
Traffic Distribution based on Cache Server Capacity
This feature allows you to use SNMP to monitor the load on cache servers and load-balance the
cache servers using that information. For this feature to operate, the cache server must run an
SNMP agent and support MIBs that can be queried by the SNMP manager software on the
ServerIron ADX.
The following specifications currently exist for this feature:
• Only HTTP traffic on port 80 is currently supported
• This feature is not supported for CSW in a TCL environment
• The default cache server state is set to OFFLINE. If an out-of-range SNMP MIB value is
received, the cache server state is set to the default state (OFFLINE).
• Only SNMPv2 is currently supported
This feature operates by performing queries to cache server states that are held in the SNMP agent
on the cache server. The ServerIron ADX then uses the cache server state obtained from the query
to determine the load balancing action to take as described in Table 6.
TABLE 6 Load balancing action as determined by cache server state
Cache Server States ServerIron ADX load balancing action
UNDERUSED (1):
Cache is operating normally with low resource
utilization
For UNDERUSED (1) or NORMAL (2) or BURDENED (3) the
action is the same:
The ServerIron ADX will allow new connections to these
cache servers and will also forward connections that were
originally hashed to other stressed cache servers to these
cache servers.
NORMAL (2):
Cache is operating normally with no resource
constraints
BURDENED (3):
Cache is operating normally but nearing
resource constraints.
STRESSED (4):
Cache has reached its effective capacity limit
and cannot stably handle additional load.
For STRESSED (4) the action is:
The ServerIron ADX will not allow new connections to
these cache servers if other under used or normal cache
servers are available. If no under used or normal cache
servers are available, ServerIron ADX will continue to use
these cache servers.
OVERTAXED (5):
Cache load has exceeded its maximum
sustainable capacity and should be decreased.
For OVERTAXED (5) or OVERLOADED (6) the action is the
same:
The ServerIron ADX will not allow new connections to
these cache servers but will continue servicing existing
connections. Any new connections will instead be
forwarded to the under used and normal cache servers.
OVERLOADED (6):
Cache load has reached an unsustainable level
and must be decreased immediately.
HALTING (7):
Cache is in the process of shutting down.
The ServerIron ADX will neither allow any new connections
nor continue servicing existing connections on these
cache servers. Any new connections will instead be
forwarded to the under used and normal cache servers.
- ServerIron ADX 1
- Document History 2
- Contents 5
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Web access 12
- E-mail and telephone access 12
- SIP Server Load Balancing 13
- SIP terminology 16
- SIP message headers 17
- Max-Forwards 18
- Sample deployment topologies 19
- RINGING F4 21
- Configuring SIP SLB 23
- Configuring health check 26
- Example 29
- Load Balancing SIP over TCP 31
- Call-ID3 33
- Call-ID1 34
- Rehashing the SIP hash table 38
- Debug commands 40
- SIP SLB command reference 42
- Sample configuration 43
- Transparent Cache Switching 45
- Stateful caching 47
- Sample Deployment Topologies 48
- TCS with spoofing 49
- TCS with destination NAT 49
- TCS with Source NAT 50
- VIPs with reverse proxy 51
- Configuring TCS 52
- Defining a cache server 53
- Enabling TCS 56
- Other TCS options 57
- Cache Route Optimization 58
- Enabling Destination NAT 62
- Configuring Source NAT 62
- Examples 64
- Distribution algorithm 66
- • Maximum connection rate 72
- Enabling FastCache 73
- Enabling remote cache 73
- Shutting down a cache server 74
- Passive FTP for TCS 75
- Traffic flow of passive FTP 76
- Topologies supported 76
- High availability support 77
- ServerIron ADX 2 78
- Policy based caching 79
- Show commands 81
- Content aware cache switching 82
- Setting up the CSW policies 84
- Configuring the cache servers 85
- This field... Displays 91
- Displaying cache information 95
- TCS information (Continued) 96
- Sample configurations 98
- Applying IP policies 99
- Defining the caches 99
- Defining the cache groups 100
- 53-1002435-01 101
- Policy-based caching 102
- Asymmetric TCS (FastCache) 103
- Policy-based cache failover 105
- TCS with reverse proxy 107
- Layer 3 TCS 109
- Basic TCS configuration 110
- Commands for ServerIron ADX A 111
- Commands for ServerIron ADX B 112
- Internet 114
- 10.10.20.104 114
- 10.10.20.102 114
- Router NI1 117
- Router NI2 117
- OSPF Area 0 117
- Commands for Router NI2 121
- Active-standby TCS 125
- Configuring Router R1 126
- Configuring ServerIron ADX A 126
- Configuring ServerIron ADX B 127
- NetCache servers 128
- NetCache C720 cache server 128
- TABLE 9 Hashing methods 130
- Parsing the host string 133
- Force rehash 136
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