Hitachi GR2000 User Manual
4.7.8.1
Cautions Regarding NextHop Resolution
When advertising paths to the BGP speaker in one and the same AS in this device,
one’s own peering address used for peering with the BGP speaker is set in
NEXT_HOP attributes. In addition, path data NEXT_HOP attributes received by the
device are resolved based on the IGP path. There is therefore no need to set the
other’s peering address in NEXT_HOP attributes and Next_Hop is resolved normally
as long as the addressing path corresponding to NEXT_HOP attributes is learned by
IGP. Designating the "resolve-nexthop all" option of the bgp command makes it
possible to extend path data used in Next-Hop resolution to the IGP and BGP paths.
one’s own peering address used for peering with the BGP speaker is set in
NEXT_HOP attributes. In addition, path data NEXT_HOP attributes received by the
device are resolved based on the IGP path. There is therefore no need to set the
other’s peering address in NEXT_HOP attributes and Next_Hop is resolved normally
as long as the addressing path corresponding to NEXT_HOP attributes is learned by
IGP. Designating the "resolve-nexthop all" option of the bgp command makes it
possible to extend path data used in Next-Hop resolution to the IGP and BGP paths.
The about Next_Hop resolution processing applies to all peer types (external peers,
peers between member ASs, internal peers).
peers between member ASs, internal peers).
Path to Ia is to be
learned by IG P.
learned by IG P.
Router A
A S
E xterna l peer
Ia