Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 128
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116 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Interoperability issues with cache servers
2
Interoperability issues with cache servers
The defaults for many of the ServerIron ADX’s parameters are applicable to most TCS
environments. However, depending on the brand of cache server you use, you might need to make
minor modifications either to the cache server or to the ServerIron ADX for interoperability.
CacheFlow server version 2.x.x and 3.x.x
These versions send HTTP error code 503 in response to an HTTP keepalive health check sent by
the ServerIron ADX. By default, the ServerIron ADX does not consider this to be a valid health check
response. To work around this issue, configure status code 503 to be a valid response to the health
check. To do so, enter the port http status_code 503 503 command at the configuration level for
the cache server. This issue has not been observed with CacheFlow version 1.x.x.
NetCache servers
When the ServerIron ADX sends a packet to a NetCache server, by default the server addresses its
replies to the packet to the source MAC address of the packet, instead of replying to the MAC
address of the server's default gateway. This causes problems, especially in one-arm routing
configurations.
To work around this issue, enter the following commands on the NetCache server.
priv set advanced
show config.system.fast_ip.enable
set config.system.fast_ip.enable off
NetCache C720 cache server
This model of cache server sends HTTP error code 500 in response to an HTTP keepalive health
check sent by the ServerIron ADX. By default, the ServerIron ADX does not consider this to be a
valid health check response. To work around this issue, configure status code 500 to be a valid
response to the health check. To do so, enter the port http status_code 500 500 command at the
configuration level for the cache server.
CSW with NetCache cache servers
When the ServerIron ADX redirects a TCP SYN to a cache server, the ServerIron ADX uses the
ServerIron ADX port's MAC address as the source MAC address and the cache server's MAC
address as the destination MAC address. The source and destination IP addresses are not
changed. The source IP address is the client's and the destination IP address is the Web site the
client is requesting.
When the ServerIron ADX receives the SYN-ACK from the cache server, the ServerIron ADX expects
the destination MAC address in the cache server's reply to belong to the destination IP address (the
requested Web site). The ServerIron ADX does not expect the destination MAC address to be the
ServerIron ADX port's MAC address.
If you are using a NetCache cache server, you must enable the server to respond appropriately to
the ServerIron ADX. To do so, access the following URL on the Netcache server:
• http:// cache_IP_address:3132/cache_config/ui_toggle_basic
- 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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