ELTEX ESR-3100 - Page 277

ESR series service routers.ESR-Series. User manual
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First of all, next-hop of the route is checked.If there is a connected route to the next-hop, it is considered
available.
The route marked as 'stale' is less priority than a route without such a label. The route is marked as
'stale'in the process of LLGR technology operation (More detailed);
The value of the Weight attribute is compared – the route with the higher value becomes the best;
The value of theLocal preferences attribute is compared –the route with the higher value becomes the
best;
The length of the AS-path is compared –the route with the least number of hopsbecomes the best;
The value of theOrigin attribute is compared –IGP is the highest priority.EGP takes precedence over
Incomplete;
The value of themultiple exit discriminator (MED)attribute is compared –the lowest attribute value has
the highest priority;
The route received from the EBGP peer takes precedence over route received from IBGP peers;
7.1If ECMP is enabled,then no further comparisons are made and the route (multipath) will be included
in the routing table;
The value of theRouter-Id parameteris compared – the route received from the BGP neighbor with the
lowest Router-Idhas the highest priority;
The number of addresses in the Cluster list is compared – the route with the least number of
addressesbecomes the best;
The addresses of the BGP peers are compared –the route received from the BGP peer with the least
addresshas the highest priority;
For VPNv4 routes, selection of the best route is as follows:
First, the choice of the best route occurs within its RD. Further, within the framework of VRF, where it
will get in accordance with its RT.
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