• Author : Travis Hammond


TAP Aggregation DCS-7280R3 / DCS-7500R3 support

Description TAP Aggregation support for the DCS-7280R3 and DCS-7500R3 series is documented below, including the release in which a given feature is available. Any feature differences with the R and R2 series will be identified, but should otherwise be equivalent. Note that the first available release to include TAP Aggregation support for the R3 series is 4.24.0F and so previous releases are not listed. Any future release not listed shall be considered equivalent to the most recently documented release. Forwarding Feature Release Supported Notes Default Port Forwarding 4.24.0F Y – Policy-Map Steering – MAC 4.24.0F Y – Policy-Map Steering –...
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Monitor Session Header Removal

Description This feature allows the removal of a configurable number of leading bytes from packets sent to a monitor session. A new per-monitor session CLI command is provided to configure this, up to a maximum of 128 bytes. Platform Capabilities DCS-7500 R / R2 Series DCS-7280 R / R2 Series Configuration Remove the first 50 bytes of mirrored packet headers for session s1: (config)# monitor session s1 header remove size 50 Change the header removal size of the same session to 80 bytes: (config)# monitor session s1 header remove size 80 Inspect header removal configuration for session s1: (config)# show...
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TAP Aggregation Extra MPLS Pop (4 to 6 Labels)

Description Extra MPLS pop is a feature for TAP Aggregation that allows one to remove 4 to 6 MPLS labels from a packet. Previously, only 1 to 3 labels were able to be popped. When configured, popping 4 to 6 MPLS labels will work in all the cases where popping 1 to 3 MPLS labels works. Generally, it will also interact with features the same way as popping 1 to 3 MPLS labels unless specified in the Limitations section. The TOI for MPLS pop for 1 to 3 labels can be found here: https://eos.arista.com/eos-4-15-0f/tap-aggregation-mpls-pop/ Platform Compatibility DCS-7020 DCS-7280/R/R2 series DCS-7500/R/R2...
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Support for mixed TTL/DSCP in MPLS tunnel termination

Description A Label Edge Router (LER) decapsulating an MPLS packet may choose to source the TTL and DSCP fields from either the MPLS header or the original inner IPv4 header. However, some applications need the TTL field value from the MPLS header, while retaining the DSCP from the original IPv4 header. This feature enables tunnel termination to select this specific mix of two modes. Platform Compatibility DCS-7020R DCS-7280R/R2 DCS-7500R/R2 Configuration This feature is intended to be used with MPLS VRF decapsulation. Therefore, a static VRF-to-MPLS-label map would also be expected to be provided, such as: mpls ip mpls static vrf-label...
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Support for MPLS packets in IP ACLs

Description Ingress and egress IPv4 and IPv6 access-lists do not automatically match the inner IP header when processing IP over MPLS traffic. Support has been provided to allow matching of the inner IP header in an access-list by adding the proper packet types to the corresponding TCAM features. Platform Compatibility DCS-7280R/R2 DCS-7500R/R2 Configuration Ingress IP Access-List Support To facilitate inner IP header matching, two new TCAM profile packet types were introduced: packet mpls ipv4 forwarding bridged packet mpls ipv4 forwarding mpls   Ingress inner IP header matching is provided by creating a user-defined profile with these new packet types. Although...
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TAP Aggregation: VXLAN Header Strip

This article describes the TAP Aggregation VXLAN Strip feature. The purpose of this feature is remove the outer L2 and VXLAN headers on a selected tap port, with the inner frame forwarded to the associated tool port(s). Supported Platforms DCS-7280E, DCS-7280R/R2 DCS-7500E, DCS-7500R/R2 Configuration VXLAN Strip is configurable on a tap port using a single switchport command: (config-if-Et1)#[no] switchport tap encapsulation vxlan strip VXLAN Interface + UDP Port A VXLAN interface must also be defined so as to set the VXLAN UDP port in the system. (config)# interface Vxlan 1 When the interface is created, the UDP port is set...
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TAP Aggregation: Traffic Steering – Extended TCAM Profile Features

This article describes the TAP Aggregation Traffic Steering features provided by the Extended TCAM Profile. This extended profile is used to provide commonly requested features at the cost of additional TCAM memory, allowing for wider keys and policy-map actions. Supported Platforms DCS-7280E, DCS-7280R/R2 DCS-7500E, DCS-7500R/R2 Extended Feature List The additional features provided by the Extended Profile are as follows: User-Defined Fields MPLS Label Match ACL Counters Tool Port Truncation MAC Steering for IPv6 Packets TCAM Bank Usage The cost of enabling the Extended TCAM Profile is that all features, including the default tap port forwarding, now consume two TCAM banks per rule,...
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TAP Aggregation – TCAM Profile Selection

This article describes a new TAP Aggregation TCAM profile and a corresponding enhancement to the TAP Aggregation mode command. The new TCAM profile is “tap-aggregation-default” and is used to support the standard TAP Aggregation features. Previously, the base TCAM profile natively supported TAP Aggregation, however to achieve better resource utilization, the TAP Aggregation TCAM features were moved into this new profile. To facilitate automatic usage of “tap-aggregation-default”, the TAP Aggregation mode command now supports applying an overlay TCAM profile. If no profile is selected, the default is chosen automatically (see Configuration).   Supported Platforms DCS-7280E, DCS-7280R DCS-7500E, DCS-7500R Configuration (config)#...
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Traffic Steering using User-Defined Fields

This article describes the TAP Aggregation User-Defined Fields feature. The purpose of the User-Defined Fields feature is to provide custom offset pattern matching to be used in TAP Aggregation Traffic Steering. This allows for deeper packet inspection of up to 128 bytes. User-Defined Fields, or UDFs, are defined as part of an access-list filter and are comprised of an offset, length and pattern match. This describes a single portion of any incoming packet to match the provided value upon. Access-list filters containing a UDF are then applied as usual as part of a TAP Aggregation Traffic Steering policy. UDFs may also be...
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Tap aggregation – MPLS pop

This article describes the 7500E Tap Aggregation MPLS Pop feature. The purpose of this feature is support tools that do not parse MPLS labels and therefore need the switch to remove (pop) the MPLS header. This feature supports both IPv4 and IPv6 over MPLS. Configuration MPLS pop is configurable at the tap port using a simple switchport command: (config-if-Et1)#[no] switchport tap mpls pop all As the command suggests, all MPLS labels will be popped. The option of selecting the number of labels to pop is not supported, but reserved as a possible future enhancement. Troubleshooting The MPLS pop feature works by...
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