Brocade Communications Systems 12.4.00 manual

GSLB optimization

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1.On controller, enable VIP list process optimization by issuing the following command at global config level.

ServerIronADX(config)# gslb process-vip-list-optimize

ServerIronADX(config)# write memory

ServerIronADX(config)# reload

NOTE

A system reload is required after enabling the gslb process-vip-list-optimizecommand.

2.Under a site definition on the controller, add the si <si-ip-address>optimized-dist-hcheckcommand.

ServerIronADX(config)# gslb site sunnyvale ServerIronADX(config-gslb-site-sunnyvale)# si-name si-1 100.1.1.1 ServerIronADX(config-gslb-site-sunnyvale)# si 100.1.1.1 optimized-dist-hcheck

Syntax: [no] si <ip-address>optimized-dist-hcheck

The si <ip-address>optimized-dist-hcheckhelps the controller identify the site that has the VIP list process optimization enabled.

NOTE

If have not completed step 1 on the GSLB controller (configured gslb process-vip-list-optimizesaved the configuration and reloaded the device), the message: "Please enable hashing to optimize vip list processing and reload!" will be displayed on the GSLB controller SI when you configure this command on the Site SI and reload.

3. Issue the gslb send-vip-list-optimizecommand on the Site ServerIronADX.

Site-ServerIronADX(config)# gslb send-vip-list-optimize

Site-ServerIronADX(config)# write memory

Site-ServerIronADX(config)# reload

Syntax: [no] gslb send-vip-list-optimize

NOTE

A system reload is required after enabling this feature.

4.If site ServerIronADX is hosting more than 217 GSLB enabled VIPs, then you need to disable the site ServerIronADX from sending active binding information. Issue the following command.

Site-ServerIronADX(config)# gslb dont-send-active-bindings

Syntax: [no] gslb dont-send-active-bindings

5.Issue the show gslb site command to determine if optimization of the VIP list processing is enabled for a Site ServerIron ADX, as shown in the following:

ServerIron ADX Global Server Load Balancing Guide	163
53-1002437-01

Image 175

Brocade Communications Systems 12.4.00 Syntax no si ip-addressoptimized-dist-hcheck, Syntax no gslb send-vip-list-optimize

Contents

ServerIron ADX Brocade Communications Systems, Incorporated Contents ServerIron ADX Global Server Load Balancing Guide Page Global server load balancing for IPv6 overview Gslb for IPv6 feature supportGslb for IPv6 example IPv6 IPv4Page Text formatting AudienceSupported hardware and software Document conventions Bold text Related publications Getting technical help or reporting errorsWeb access Mail and telephone accessPage Global Server Load Balancing overview Global Server Load Balancing Basic concepts Global Server Load Balancing overview Gslb example Global Server Load Balancing configuration DNS Gslb policy Server health Weighted IP metric Site ServerIron ADX’s session capacity threshold Weighted site metricActive bindings metric Geographic location of the server Site ServerIron ADX’s available session capacity tolerance Site ServerIron ADX’s connection loadSite ServerIron ADX’s FlashBack speed Least response selection Site ServerIron ADX’s administrative preferenceRound robin selection 128 Basic controller and site communication Minimum required configuration Syntax show gslb policy Configuring Gslb Configuring GslbPage Adding a source IP address Proxy for DNS serverProxy for DNS server Syntax no server source-ipip-addr ip-mask default-gateway Enabling the Gslb protocol Configuring a siteSyntax no gslb protocol Syntax no gslb site name Specifying site locations Specifying Gslb controller locations Configuring a zoneSyntax no gslb dns zone-name name Syntax no dns cname-detect Applying Gslb to Cname records Cname status is shown in bold type Configuring Http health check parameters Configuring DNS domain name aliases Configuration example Configuring null host namesSyntax host-info host-namealias alias-name Syntax dns override Private VIPs for Gslb Private VIPs for Gslb Configuring a public IP address for a VIP Displaying Gslb IP information Private VIP display informationShow gslb dns detail the following is an example Syntax show gslb site Configuring Gslb protocol parametersChanging the protocol port number Syntax show server virtual-name-or-ip You can modify the following DNS-related Gslb parameters Changing the Gslb protocol update periodModifying Gslb parameters related to DNS responses Syntax no protocol status-interval num Syntax no dns best-only Removing IP addresses for sites that fail a health check Syntax no dns ttl num Changing the query intervalSyntax no dns check-interval num Changing the TTL for DNS records Syntax no dns override Syntax no dns ttl Enabling DNS override Changing the Gslb policy metrics Metric Default Configuration options Configuring Gslb protocol parameters Gslb policy metrics Connection load Syntax no metric-order set list Changing the order of Gslb policy metrics Disabling or re-enabling individual Gslb policy metrics Syntax metric-order default Syntax clear gslb dns zone-name name Clearing DNS selection counters DNS response processing Implementing the weighted IP metric For name, enter up to 32 characters Configuring weighted IP metricsSyntax no weighted-ip Syntax no gslb dns zone name Syntax host-info www ip-weight IP address weight Syntax show gslb dns zone Implementing the weighted site metric San Jose 50% New York 30% London 20% Total 100 100% Syntax weight weight Traffic distribution specificationsConfiguring weighted site metrics Syntax no weighted-site Syntax gslb site site name Syntax show gslb traffic site First example shows the first two sites Site Three Implementing the active bindings metric Enabling active bindings Gslb active bindings enhancements Configuring weighted active bindings Specifying the site connection limit Configuring connection load parameters Changing the sampling intervals and sample rate Syntax no connection-load limit average-load Syntax no connection-load weights weight1 weight2...weight8 Changing the sample interval weight Syntax no flashback application tcp tolerance num Changing the FlashBack tolerance valuesSyntax no capacity threshold num Syntax no num-session tolerance num Changing the RTT cache interval Modifying round-trip time values Changing the RTT tolerance Syntax no round-trip-time cache-interval numChanging the RTT cache prefix Syntax no round-trip-time cache-prefix num Adding static prefix cache entries Syntax no round-trip-time explore-percentage num Secure Gslb Enabling default geographic locationPage Secure Gslb Gslb message content randomizationConfiguring secure Gslb RSA challenge dialogue Generating RSA key pair Configuring secure-communication on the controller Exchanging public keys Bob sends back his public key C.D Selecting a peer public key management option Syntax clear gslb session-keys Regenerating the session keysManually regenerating the session keys Dynamically regenerating the session keys Minimum Gslb configuration Site persistence in Gslb using stickiness Algorithm Enabling sticky Gslb Site persistence in Gslb using stickiness Syntax no sticky age value Configuring the sticky Gslb session life timeAllowing sticky sessions for a specific prefix length Syntax no sticky Syntax show session all offset Displaying current sticky Gslb sessions Syntax show gslb dns detail Sticky Gslb counters Enabling hash-based Gslb persistence Site persistence in Gslb using hashingDeleting sticky Gslb session for a specific client Deleting all sticky Gslb sessions Syntax show gslb phash table Hashing scheme Rank IP address allocationIP address failure or removal from domain Rehash new IP address for a domain or change of state Disabling rehash Manually forcing rehash for a domain Syntax hash-persist persist-rehash-disable time-outSyntax hash-persist hold-down time Show commands This section contains the following subsections Weighted distribution of sites with hash-based persistenceWeighted distribution of sites with hash-based persistence Syntax show gslb phash table zone-name name host-name name IP address allocation Gslb weighted hash-based persistenceGslb hash-based persistence Hashing scheme IP address failure or removal from domain Disabling rehash on change in hash weight configuration Rehash change in hash weight Syntax no hash-persist weighted Enabling weighted hash-based Gslb persistenceSyntax no prefix-len-hash-persist length Disable rehash when weight for an IP is changed Configuring weights for domain IP addressesSyntax host-info host-nameip-hash-weight IPaddress weight Syntax no hash-persist disable-weight-rehash Hash persist hold down timer Syntax show gslb policy host-policy-name policy-name Show commandsManually forcing rehash for a domain Clear Gslb phash counters Displaying the contents of active RTT cache entries Affinity Affinity Syntax gslb affinity Defining the affinity Syntax show gslb cache ip-addr Displaying RTT prefix cache entries Syntax show gslb dns detail name Gslb domain-level affinityDisplaying affinity selection counters Overview of Gslb domain-level affinity Associating the domain-level group with a domain Command line interfaceConfiguring an affinity for prefix 0.0.0.0/0 Creating a domain-level affinity group Syntax show gslb resources Show gslb affinity-group group-numberSyntax show gslb affinity-group group-number Show gslb resources Syntax show gslb dns detail zone-name DNS cache proxyDNS cache proxy Show gslb dns detail Syntax no dns cache-proxy To enable DNS cache proxy, enter the following commandsEnabling DNS cache proxy Displaying DNS cache proxy state Displaying DNS cache proxy statistics DNS cache proxy Disable the defaultSyntax show gslb global-stat Gslb DNS type any query Combining the DNS cache proxy and DNS override features Transparent DNS query intercept Transparent DNS query intercept configuration Transparent DNS query intercept Redirecting queries Syntax no server virtual-name-or-ip name ip-addrintercept Syntax no server remote-name name ip-addrSyntax no source-nat Syntax no port dns Syntax no bind dns real-server-namedns Redirecting queries and perform GslbSyntax ip policy index cache udp dns global Responding to queries directly Syntax dns transparent-intercept Displaying transparent DNS query intercept statistics Syntax no gslb log-dns Enabling DNS request loggingEach message shows the following information Enabling DNS request logging Gslb request information Support for the RTT metric BP support as Gslb agent Distributed health checks for GslbEnabling DNS request logging ADX Syntax no si-name name ip-addrno-si-dist-health-check Syntax no no-distributed-health-check Configuring the health status reporting intervalSyntax no si-name name ip-addrenable-si-dist-health-check Disabling or re-enabling distributed health check Syntax no agent-health-report-interval secs Configuring the agent health report intervalDebugging the distributed health check Syntax no health-status-interval secs Impact of distributed health checks on the Flashback metric Topology Configuration examplesExample Example Example Steps involved in a Dnssec resolution are Dnssec Example with Authentication Chain Dnssec Verification with DIG Dnssec Gslb in DNS proxy mode Configuring a backend Adns server as Dnnsec capable Configuring Dnssec for GslbCache proxy mode Configuring a zone for Dnssec Syntax no server use-dnssec-servers-for-dns-queries Displaying Dnssec configurationDisplaying Dnssec statistics Syntax no port dns use-dnssec-servers-for-dns-queries Host-level policies for site selection Configuring host-level policiesHost-level policies for site selection Global vs host-level policy Defining a name for a host-level Gslb policy Configuring the parameters for the host-level policy Removing all IP addresses except the best address Syntax no dns active-only Modifying Flashback tolerance To re-enable this metric, enter the following commandDisabling or re-enabling the Flashback metric Syntax no flashback Syntax no health-check Enabling the Geographic metricSyntax no geographic Enabling the Health Check metric Resetting the order of the metrics Enabling the Preference metric Configuring the Num-session ToleranceEnabling the Num-session metric Syntax no num-session Syntax no round-trip-time Changing the RTT tolerance Syntax no weighted-ipEnabling the weighted site metric Syntax no round-robin Enabling the Round-Trip-Time metric Displaying a host-level policy Syntax no weighted-siteDisplaying host-level policy information Applying a host-level policy to a Gslb host Syntax show gslb policy host-policy-all Displaying all Gslb policies Displaying the number of host-level policies Displaying the policy used for hostsSyntax show gslb dns zone I detail Syntax clear gslb host-policy policy-name Configuration exampleDeleting Gslb host-level policies Deleting a policy that is not applied to a host How geographic location is determined Geographic region for a prefix For IPv4 Configuring a geographic prefixFor IPv6 Syntax show gslb cache IP address prefix Displaying the number of geographic prefixesDisplaying information about geographic prefix Geographic region for a prefix Syntax show gslb cache all geographic user-configured Example configuration 90% of 22ms + 10% of 1 sec = 119ms Smoothing mechanism for RTT measurementsSmoothing mechanism for RTT measurements 90% of 20ms + 10% of 40ms = 22ms 134 Syntax gslb enhanced-rtt-smoothing Enabling enhanced RTT smoothing Disabling enhanced RTT smoothing Configuring the parameters Syntax no ramp-down-factor value Specifying the ramp-up-factorSyntax no ramp-up-factor value Specifying the ramp-down factor Syntax rtt-val value Syntax enable-sim-new-rtt-smoothSyntax disable-sim-new-rtt-smooth State gets cleared. You can command in the simulation Smoothing mechanism for RTT measurements Smoothing mechanism for RTT measurements Round-trip times Determining if the new RTT smoothing mechanism is enabledRound-trip times Passive RTT gathering Passive RTT gathering Active RTT gathering Active RTT gathering Support for both active and passive RTT Enabling active RTT Active RTT gathering issues and trade-offs Syntax no gslb active-rtt-gathering Syntax no gslb disable-rtt-gatheringDiscarding passive RTT Disabling passive RTT gathering Specifying how often to report the active RTT Configuring active RTT parametersConfiguring active RTT query message interval Configuring the cache interval for active RTT prefix Setting the RTT algorithm modes Configuring the active RTT refresh intervalSyntax no gslb agent-rtt-refresh-interval value Using only passive RTT Accepting DNS RTT measurements Syntax gslb dns-probe enable-fallbackSyntax gslb dns-probe disable-fallback Probes for RTT gathering Sending DNS probes on a different port Aging out prefixes when Icmp probe failsAging out prefixes when DNS probe fails Enabling the DNS prober Active RTT gathering and high availability support Displaying the RTT gathering mechanism Displaying RTT information Syntax show gslb active-rtt-info Displaying the active RTT gathering configuration Round-trip times Show Gslb active RTT information Displaying the RTT information of a client IP addressSyntax show gslb cache ip-address This field Displays For example, enter a command such as the following Displaying the RTT algorithm mode Gslb affinity for high availability Configuring an HA groupGslb affinity for high availability Enabling dynamic detection Syntax no gslb dynamic-peer-detect Displaying HA informationDisplaying all HA groups Displaying the HA peer for a site Displaying the dynamically detected HA pairs Gslb affinity for HA View the configured HA group using the following command Syntax no gslb process-vip-list-optimize This command requires a reload to take effectGslb optimization Optimized VIP list processing Syntax no gslb send-vip-list-optimize Syntax no si ip-addressoptimized-dist-hcheckSyntax no gslb dont-send-active-bindings Gslb optimization On the site ServerIron ADX, configure the following commands Displaying Gslb information Guidelines and recommendations for using this featureDisplaying Gslb information Displaying site information Name parameter specifies a site name Syntax show gslb site name Site Displaying Gslb information Global SLB site information Displaying real server information Syntax rshow remote-ip-addrserver real virtual session bind Syntax show gslb dns zone name Displaying DNS zone and hosts Zone Displaying detailed DNS information Host a Flashback Displaying metric information Syntax show gslb default Displaying the default Gslb policy DNS TTL Displaying Gslb information Gslb policy information Displaying the user-configured Gslb policy ServerIronADXconfig# show gslb cache Static prefix cache entries on Displaying Gslb resources This command shows the following information Gslb resources Session statistics Another way to list the real servers Displaying dynamic server informationDisplaying Gslb information Gslb resources Port binding information The TCP and UDP ports Displaying virtual server information Displaying dynamic real server informationSyntax show server dynamic real Syntax show server dynamic bind Displaying the port bindingsListing the real servers Syntax show server dynamic virtual Syntax show gslb cache all Specifying the source IP of probesDisplaying information in the prefix cache Syntax gslb src-ip-active-rtt ip-address Syntax show gslb cache ip-addrlonger-than prefix-length Syntax show gslb cache all affinitySyntax show gslb cache all geographic static Syntax show gslb cache all ip-addr Snmp traps and syslog messages Snmp traps and syslog messagesSyntax show gslb cache ip-addrsmaller-than prefix-length Syntax show logging Syslog messages Syntax no snmp-server enable traps trap-type Gslb error handling for unsupported DNS requestsDisabling and re-enabling traps Using Gslb error handling with transparent intercept mode Default settings for Gslb error handling Gslb error handling for unsupported DNS requests Error handling response formatDisable or re-enabling Gslb error handling Configuring the return code Clearing the error handling statistics Viewing error handling statisticsSyntax clear gslb unsupported-response-cnt Gslb error handling for unsupported DNS requests Global server load balancing for IPv6 overview Global Server Load Balancing for IPv6 Gslb for IPv6 feature support Gslb for IPv6 example IPv6 Gslb configuration On Gslb ServerIron ADX controller Basic Gslb for IPv6 configuration Enabling DNS cache proxy Configuring the Gslb controllerBasic Gslb for IPv6 configuration Adding a VIP for the Adns server Enabling DNS override Configuring zones Syntax no host-info host-nameip-list ipv6-address Specifying DNS override IP listsHost-nameparameter specifies the host name Configuring sites Enabling the Gslb protocol Site ServerIron ADX configurationBasic configuration example Configuration on Gslb ServerIron ADX Gslb controller Enable the Gslb protocol on each of the Site ServerIron ADXs Configuration on site ServerIron ADXs Gslb site persistence Advanced Gslb configuration for IPv6 Refer to Server host health Configuring Gslb policy metrics for IPv6 Not supported Refer to FlashBack speed metric Changing the order of Gslb for IPv6 policy metrics Syntax no metric-order set list Server host health metric Resetting Gslb policy metrics Enabling the weighted IP metric Weighted IP metric Advanced Gslb configuration for IPv6 Specifying the weight of IP addresses in the IP listFor zone-name, enter up to 32 characters Weighted site metric DNS response processing Traffic distribution specifications Session capacity threshold metric Configuring weighted site metrics Enabling active bindings Active bindings metricSyntax no active-bindings Configuring weighted active bindings Geographic location metric Specifying site locations Configuring a geographic prefixSpecifying Gslb controller locations Available session capacity metric FlashBack speed metric Administrative preference metric Least response selection metric Configuring administrative preference for a siteRound robin selection metric Sticky persistence for IPv6 Enabling sticky persistence for IPv6 Syntax no sticky ipv6-prefix-length decimal Specifying sticky session prefix lengthsSpecifying sticky session life times Deleting sticky sessions Specifying hash-based persistence prefix lengths Hash-based persistence for IPv6 Manually forcing a rehash for a domain Weighted hash-based persistence for IPv6Syntax no ipv6-prefix-len-hash-persist decimal Configuring weights for domain IP addresses Disabling rehash when weight for an IP is changed Configuring an active-only policy Configuring DNS response parameters Gslb of ANY queries Configuring a best-only policy Show commands for basic Gslb configurations Displaying Gslb for IPv6 configurationsDisplaying DNS cache proxy statistics Displaying Gslb for IPv6 configurations Displaying the default Gslb policy DNS TTL Displaying the user-configured Gslb policy Displaying information about a geographic prefix ServerIronADX VIP === Displaying DNS zone and hosts When you configured the zone information Africa X100us Counters 2001db8abc Cfg Zone-nameparameter specifies a particular Gslb zone Displaying site information Specifying the weight of IP addresses in the IP list on ServerIronADXconfig# show gslb site Administrative preference metric on Displaying the hash table Show commands for advanced featuresSite-nameparameter specifies a site name Syntax show gslb ipv6 phash active-ip allocation table Troubleshooting Gslb for IPv6 configurationsClearing Gslb phash counters Displaying Gslb debug counters Troubleshooting Gslb for IPv6 configurations Debug trace for Gslb Troubleshooting IPv6 listsSyntax show gslb message IPaddress Syntax debug track feature gslb algorithm sticky generic all Troubleshooting Gslb for IPv6 configurations IPv6 IPv4IPv4 RFC DNS South America Address Designation IPv6 address assignment Lacnic