• Author : Kenneth Cheung


Configurable dynamic MAC learning limit threshold on 7800R3/7500R3/7280R3

Description EOS 4.26.1F releaseĀ  added a platform configuration command to modify the dynamic MAC learning limit threshold on 7800R3, 7500R3 and 7280R3 hardware series. This enables customers to potentially scale the size of the L2 MAC table beyond the default thresholds by utilizing more of the LEM table capacity. Platform compatibility DCS-7800R3 DCS-7500R3 DCS-7280R3 Feature History Release Update EOS 4.26.1F Initial introduction Configuration In global configuration mode, the following command may be used to configure the learning limit, for example, to 130,000 MACs: switch(config)#platform sand mac-address-table learning limit 130000 The learning limit threshold should be set to less than the...
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MLAG Unicast Convergence

On a MLAG chassis, MAC addresses learned on individual peers are synced and appropriate interfaces are mapped to these MAC addresses. In case of unexpected events like reloading of one of the peers in the MLAG chassis or flapping of one or more MLAG interfaces, some loss of traffic may be observed. If a MLAG flaps on one peer, learned MAC addresses may have to be remapped to different interfaces such that the reachability is via the other peer in the MLAG domain. Until the remapping of MAC addresses and host routes complete, some amount of traffic may drop and...
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7800R3/7500R3/7280R3 MLAG support

Description EOS-4.23.1F added basic MLAG support for 7800R3, 7500R3 and 7280R3 platforms. The MLAG features that are currently supported are: Bridging Routing STP VARP L2 Multicast Starting in EOS-4.24.0F, the following feature is supported: Fast MLAG Unicast Convergence Platform compatibility DCS-7800R3 DCS-7500R3 DCS-7280R3 Configuration Refer to the MLAG basic configuration TOI document, as referenced below, for details on configuring a basic MLAG. Limitations The following limitations exist: Peer link must be configured as a LAG. Specifically, it cannot be a single front panel port. (BUG409958) Fast MLAG unicast convergence is not supported (BUG386201) starting in EOS-4.23.1F. In EOS-4.24.0F this limitation...
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Expanded VRRP, VARP, and MLAG Peer Gateway Virtual MAC Capabilities on the 7500R, 7280R, 7500R2, 7280R2, 7020R Series

EOS-4.20.1F introduces expanded VRRP, VARP and MLAG Peer Gateway virtual MAC capabilities on the 7500R, 7280R, 7500R2, 7280R2, and 7020R series because of improved hardware capabilities. The highlights are: Simultaneous support for VRRP, VARP and MLAG Peer Gateway. VARP and MLAG Peer Gateway take priority over VRRP Support for IPv4 and IPv6 Dual Stack VRRP Platform Compatibility DCS-7500R/R2 series DCS-7280R/R2 series DCS-7020R series Configuration For detailed VRRP, VARP, and MLAG Peer Gateway configuration information and examples please refer to links in the Resources section. Hardware oversubscription on the 7500R, 7280R, 7500R2, 7280R2, and 7020R series is defined as exceeding 16...
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Packet Time Stamping on the 7500R/7280R/7500E/7280E

Time stamping is an important tool for network engineering and performance analysis. EOS-4.18.1F added header time stamping of all packets received on any tap interface in Tap Aggregation mode at line rate (only supported on the 7500R/7280R/7500E/7280E series). A timestamp is taken on ingress and then inserted in packet headers on egress. Time Synchronization and Time Keeping In order to have accurate time stamps, the system must be set up to synchronize its time keeping engine on the data plane to a master clock. Prior to 4.20.5F, the clocks used for time stamping are not synchronized with external sources. Beginning...
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