• Author : Ramakrishnan G G

 
 

IPv6 prefix optimizations in R3 series

Description IPv6 routes of certain prefix lengths can be optimized for enhanced route scale on R3. This TOI explains the usage of these optimizations. Feature History The release in which different features were supported in different platforms are as below: Feature Platform Release Support for /128 prefix length optimization in the R3 series DCS-7280R3 DCS-7500R3 DCS-7800R3 EOS-4.26.2F Enable IPv6 prefix optimization on the specified VRF(s) DCS-7280R3 DCS-7500R3 DCS-7800R3 EOS-4.26.2F Configuration Support for /128 prefix length optimization in the R3 series Starting from the release 4.26.2F series, /128 prefix length optimization command will be supported in the R3 series. The configuration...
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L2 EVPN MPLS Shared ESI Label

Description In a multihomed EVPN MPLS configuration, BUM packets sent from a non-designated forwarder (Non-DF) PE to a designated forwarder (DF) PE must carry ESI label advertised by the egress DF PE. When the egress DF PE receives a packet with ESI label that it has advertised, it does not forward the packet on the ethernet segment (ES) corresponding to that ESI label. This avoids sending the packet back to the same ES from which the BUM packet originated. However, when a DF election is triggered, a PE may change its role from being Non-DF to DF. Since DF election...
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L2 EVPN MPLS on DCS-7280R, DCS-7280R2, DCS-7500R, DCS-7500R2 series

Description The L2EVPN MPLS feature is available when configuring BGP in the multi-agent routing protocol model. Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family number 25) / EVPN (subsequent address family number 70). It is used to exchange overlay MAC and IP address reachability information between BGP peers. The release in which different features were supported in different platforms are as below: Feature Platform Release L2 EVPN MPLS singlehoming and multihoming DCS-7280R, DCS-7280R, DCS-7500R, DCS-7500R2 EOS-4.20.5 L2 EVPN MPLS singlehoming and multihoming DCS-7020 EOS-4.25.1F L2 EVPN MPLS singlehoming on L2...
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Hardware load-balancing for ingress/egress and fabric/egress replication

In ingress/egress and fabric/egress replication mode, on DCS-7280E, DCS-7280R, DCS-7500E and DCS-7500R, Broadcast, Unknown Unicast and Multicast (BUM) traffic is load balanced over LAG members on a per-replication group basis. Distribution of BUM traffic and multicast groups over LAG member ports is decided by software and the hardware is configured accordingly. This would result in following shortcomings: As each replication group is associated with a specific LAG member port, the member port may carry more traffic than other members of the LAG (BUG177895). When a LAG member goes down, the replication groups carried by it are redistributed to other LAG...
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Disable usage of ingress interface in ECMP hashing

By default, ingress interface is used for ECMP hash calculation. If the same packet ingresses through two different interfaces, the output interface for an ECMP set may vary for the two packets. This feature helps in┬ádisabling the usage of ingress interface for ECMP hash calculation. Platform compatibility DCS-7280E series DCS-7500E series DCS-7280R series DCS-7500R series Terminology Hash preset – A combination of hash polynomial, hash seed and key shift to use in layer 3 ECMP hashing. Hash preset overrides custom hash polynomial. Configuration Disabling the ingress interface in ECMP hashing works by choosing a random hash preset. To disable usage...
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