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If a server group is configured for dual health check, a real-service is declared to be UP only when both health-check probes are simultaneously UP; otherwise, a real-service is declared to be DOWN. An AMS interface configured under a TLB instance uses its configured member interfaces exclusively for health checking of configured multiple real servers. The member interfaces must be in the same routing instance as the interface used to reach real servers.

This is mandatory for TLB server health-check procedures. The virtual service provides a virtual IP address VIP that is associated with the group of servers to which traffic is directed as determined by hash-based or random session distribution and server health monitoring.

Although you can assign a virtual address of 0. Traffic Load Balancer configuration limits are described in Table 4. Starting in Junos OS Release In earlier releases, the maximum number of instances is If multiple virtual services are using the same server group, then all of those virtual services must use the same load balancing method to support TLB instances.

To perform the same function as the layer2-direct-server-return mode and have support for TLB instances, you can use the direct-server-return mode and use a service filter with the skip action. Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. Traffic Load Balancer Modes of Operation Traffic Load Balancer provides three modes of operation for the distribution of outgoing traffic and for handling the processing of return traffic.

Load balancing works by changing the Layer 2 MAC of packets. Real servers must be directly Layer 2 reachable from the MX Series router. TLB installs a route and all the traffic over that route is load-balanced. TLB never modifies Layer 3 and higher level headers. The PFE performs stateless load balancing: Data traffic directed to a virtual IP address undergoes translation of the virtual IP address to a real server IP address and translates the virtual port to a server listening port.

TLB supports hash-based load balancing or random load balancing. Note: NAT is not applied to the distributed flows. Use a custom health check probe to specify the following: Expected string in the probe response String that is sent with the probe Server status to assign when the probe times out up or down Server status to assign when the expected response to the probe is received up or down Protocol � UDP or TCP TLB provides application stickiness , meaning that server failures or changes do not affect traffic flows to other active servers.

TLB provides two levels of server health monitoring: Single Health Check�One probe type is attached to a server group by means of the network-monitoring-profile configuration statement. Note: The following restrictions apply to AMS interfaces used for server health monitoring: An AMS interface configured under a TLB instance uses its configured member interfaces exclusively for health checking of configured multiple real servers.

Virtual Services The virtual service provides a virtual IP address VIP that is associated with the group of servers to which traffic is directed as determined by hash-based or random session distribution and server health monitoring.

The virtual service configuration includes: Mode�indicating how traffic is handled translated or transparent. The group of servers to which sessions are distributed. The load balancing method. Routing instance and route metric. Best Practice: Although you can assign a virtual address of 0.

Related Documentation Interchassis High-Availability. Understanding AMS Interfaces. Junos Release. Max of Instances per Chassis. Max of Virtual Services per Instance. Max of virtual IP address per virtual service. Max of Groups per Instances. Max of Real-Services Servers per Group. Max of groups per virtual service. Max of Network Monitor Profiles per Group.

Supported Health Check Protocols. Transparent Layer 3 Direct Server Return. Transparent Layer 2 Direct Server Return. Not Supported. Maximum number of instances.

Maximum number of servers per group. Maximum number of virtual services per services PIC. Maximum number of health checks per services PIC in a 5-second interval. Maximum number of groups per virtual service. The following sections describe how to configure protocol-independent load balancing and how this configuration can affect routing policies:.

IPv4�You only need to configure the multipath statement at either the [edit routing-instances routing-instance-name routing-options] hierarchy level or the [edit routing-instances routing-instance-name routing-options rib routing-table-name ] hierarchy level.

IPv6�You need to configure the multipath statement at both the [edit routing-instances routing-instance-name routing-options] hierarchy level and the [edit routing-instances routing-instance-name routing-options rib routing-table-name ] hierarchy level. You cannot configure the multipath statement and sub-statements at the same time that you have configured the l3vpn statement. To configure protocol-independent load balancing for Layer 3 VPNs, include the multipath statement:.

When you include the multipath statement at the following hierarchy levels, protocol-independent load balancing is applied to the default routing table for that routing instance routing-instance-name. The [edit logical-systems] hierarchy level is not applicable in ACX Series routers. When you include the multipath statement at the following hierarchy levels, protocol-independent load balancing is applied to the specified routing table:.

When you include it, protocol-independent load balancing is applied to VPN routes that are equal until the IGP metric with regard to route selection. When you do not include it, protocol-independent load balancing is applied to VPN routes that are equal until the router identifier with regard to route selection. The vpn-unequal-cost statement is not applicable in ACX Series routers.

The equal-external-internal statement is also optional. When you include it, protocol-independent load balancing is applied to both internal and external BGP paths. You can configure this in conjunction with egress IP header filtering enabled with the vrf-table-label statement. This means that when there are both paths with chained next hops and paths with nonchained next hops as candidates for EBGP equal-cost multipath ECMP , the paths using chained next hops are excluded.

If you enable protocol-independent load balancing for Layer 3 VPNs by including the multipath statement and if you also include the load-balance per-packet statement in the routing policy configuration, packets are not load-balanced. When you include the multipath statement in the VRF routing instance configuration, the paths are no longer marked as BGP paths but are instead marked as multipath paths.

Packets from the PE router are not load-balanced. To ensure that VPN load-balancing functions as expected, do not include the from protocol statement in the policy statement configuration. The policy statement should be configured as follows:.

Junos OS Release The hash algorithm is performed as follows:. The PE routers in the candidate set are numbered from lower to higher IP address, starting from 0. A bytewise exclusive-or of all the bytes is performed on the C-root source and the C-G group address. The result is taken modulo n , where n is the number of PE routers in the candidate set. The result is N.

IBGP paths are not used to propagate the join messages. On discovering the first EBGP path, only new join messages get load-balanced across available EBGP paths, whereas the existing join messages on the multicast tunnel interface are not redistributed. The algorithm first numbers the upstream PE routers from lower to higher IP address starting from 0. To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

The following example requires you to navigate various levels in the configuration hierarchy. To configure the PE1 router:. Repeat this procedure for every Juniper Networks router in the MVPN domain, after modifying the appropriate interface names, addresses, and any other parameters for each router.

Configure the mode for C-PIM join messages to use rendezvous-point trees, and switch to the shortest-path tree after the source is known.

From configuration mode, confirm your configuration by entering the show routing-instances command. From operational mode, run the show mvpn c-multicast command. The output shows how the PE3 router has load-balanced the C-multicast data for the different groups.

Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. VPN Per-Packet Load Balancing By default, when there are multiple equal-cost paths to the same destination for the active route, the Junos OS software uses a hash algorithm to select one of the next-hop addresses to install in the forwarding table.

Note: You can include the vpn-unequal-cost equal-external-internal statement and the l3vpn statement at the [edit routing-options forwarding-options chained-composite-next-hop ingress] hierarchy level simultaneously. Layer 3 VPN Load Balancing Overview The load balancing feature allows a device to divide incoming and outgoing traffic along multiple paths in order to reduce congestion in the network. Note: This example demonstrates how load balancing and IP header filtering work together.

Note: These statements are available only in the context of a routing instance. Note: This example was tested using logical systems logical routers. Configuration Procedure CLI Quick Configuration Step-by-Step Procedure Results CLI Quick Configuration To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Step-by-Step Procedure The following example requires that you navigate various levels in the configuration hierarchy. Configure BGP groups for traffic through the entire network. Configure the following: Configure the routing instance on the PE devices for exporting routes through the autonomous systems. Results From configuration mode, confirm your configuration by entering the show configuration command. Verification Confirm that the configuration is working properly. Action From operational mode, run the show route protocol bgp command.

Meaning BGP is functional in the network. Verifying Load Balancing Purpose Action Meaning Purpose Verify that forwarding is taking place in both directions by checking: If both next hops are installed in the forwarding table for a route. If external BGP routes are installed in the forwarding table for a route. Meaning Multiple next hops for a route, including external BGP routes, are installed in the forwarding tables.

The following sections describe how to configure protocol-independent load balancing and how this configuration can affect routing policies: Configuring Load Balancing for Layer 3 VPNs Configuring Load Balancing and Routing Policies Configuring Load Balancing for Layer 3 VPNs The configuration of protocol-independent load balancing for Layer 3 VPNs is a little different for IPv4 versus IPv6: IPv4�You only need to configure the multipath statement at either the [edit routing-instances routing-instance-name routing-options] hierarchy level or the [edit routing-instances routing-instance-name routing-options rib routing-table-name ] hierarchy level.

Note: You cannot configure the multipath statement and sub-statements at the same time that you have configured the l3vpn statement. Configuring Load Balancing and Routing Policies If you enable protocol-independent load balancing for Layer 3 VPNs by including the multipath statement and if you also include the load-balance per-packet statement in the routing policy configuration, packets are not load-balanced.

Before you begin: Configure the device interfaces. The hash algorithm is performed as follows: The PE routers in the candidate set are numbered from lower to higher IP address, starting from 0. Configuration CLI Quick Configuration Procedure Results CLI Quick Configuration To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Procedure Step-by-Step Procedure The following example requires you to navigate various levels in the configuration hierarchy. To configure the PE1 router: Note: Repeat this procedure for every Juniper Networks router in the MVPN domain, after modifying the appropriate interface names, addresses, and any other parameters for each router.

Results From configuration mode, confirm your configuration by entering the show routing-instances command. Action From operational mode, run the show mvpn c-multicast command.

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Ada county humane society	Uses the second label from the bottom for calculating the hash key, for example if the top labels do not provide sufficient variable for the required level here entropy. Use firewall filters when necessary to select traffic from the ingress interface. Any packets that have the same source and destination address will be sent over the same path. Sample Output 5 The following configuration output is for transit koad R9. Results From configuration mode, confirm your configuration by entering the show routing-instances command. Include the most significant byte of the source port in networl hash key.
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Change in healthcare nursing essay	This is a simple hashing method that might not yield as even a distribution as crc-sgip yields. This may here be muniper because these protocols are networi as a separate flow. Load balancing works by changing the Layer 2 MAC of packets. The default hashing algorithm is crc-sgip. Note: For both port-mirror and port-mirror-instance actions, the output interface must network load balancing juniper enabled with Layer 2 family and not family MPLS Layer 3 for the selective port mirroring feature to work.

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