• Tag : 4.17.0F


eBGP IP next-hop unchanged

The eBgp “ip next-hop unchanged” feature allows a router to send routes to its eBgp peers without changing their next-hops to its own peering address. By default a Bgp router, as defined in RFC 4271, changes the next-hop attribute of a route to its own address before sending it out to its eBgp peer. The router uses third party address as next-hop when the eBgp peers are within the same subnet as the source of the prefixes. Users may need further flexibility for multihop eBgp peer other than the above cases. If the command proposed by this feature is configured,...
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CLI command to explain BGP best path selection

This feature provides the ability to track the reason why a BGP path is excluded from the BGP best path selection process. For a given prefix, the show command output indicates how the winning best path was determined by adding a reason next to every losing path. Please refer to the full BGP best path selection process document for more details. BGP best path selection process Platform compatibility This feature is provided on all platforms. Status Show Commands The explanation for the BGP best path selection process decision can be found within the output of show ip bgp <prefix> detail...
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IS-IS Adjacency Uptime

IS-IS adjacency-uptime describes the uptime or downtime of neighbors since the last state change. Status show isis neighbor detail can be used to know the adjacency uptime of neighbors. The output shown below states that the neighbor router is in the UP state for 15 mins and 40 seconds. Arista1#show isis neighbor detail Instance VRF System Id Type Interface SNPA State Hold time Circuit Id 1 default 1720.1600.2002 L1 Ethernet1 2:1:0:2:0:0 UP 7 1720.1600.2002.04 Area Address(es): 49.0001 SNPA: 2:1:0:2:0:0 Advertised Hold Time: 9 State Changed: 00:15:40 ago LAN Priority: 64 IPv4 Interface Address: IPv6 Interface Address: none Interface name:...
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IS-IS over GRE tunnels

This feature enables an Arista switch to run the IS-IS routing protocol over a tunnel interface to another IS-IS neighbor when the switch and neighbor are separated by one or more IP networks.  Because IS-IS is not an IP protocol, GRE is used as the tunnel encapsulation service since GRE packets can handled by IP networks.  A GRE tunnel can also be used to avoid creating IS-IS state on transit networks between two IS-IS neighbors. Two tunnels are required in order to provide a virtual bidirectional link between separated IS-IS neighbors A and B. One tunnel originates at neighbor A...
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Arista EOS 4.17.0F Release – Transfer of Information

Arista Platform Independent Features IS-IS over GRE tunnels IS-IS adjacency uptime CLI command to explain BGP best-path eBGP IP next-hop unchanged Maximum number of accepted routes in BGP BGP Policy config enhancements IPv4 Addressless Forwarding on IPv6 addressed Interfaces for BGP RFC5549 support RFC 5549 support for BGP OSPFv3 BFD RFC 5838 support for OSPFv3 (AF support) LDP IS-IS Segment Routing QoS Profiles MapReduce tracer support for MR2 BFD enhancements MLAG heartbeat timeout enhancements Port-Channel member-status logging Event Manager on-logging handler Event Manager TCollector counters Event Manager custom bash counters CloudVision eXchange Bug Alerts Arista 7010/7050X/7250X/7300X Specific Features L3 interface ingress...
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