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| -rw-r--r-- | doc/user/bgp.rst | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst index bca52fed3f..861e3d0d6d 100644 --- a/doc/user/bgp.rst +++ b/doc/user/bgp.rst @@ -1549,8 +1549,9 @@ is specified, the BGP protocol process belongs to the default VRF. BGP routes may be leaked (i.e., copied) between a unicast VRF RIB and the VPN safi RIB of the default VRF (leaking is also permitted between the unicast RIB -of the default VRF and VPN) or routes may be leaked directly between two BGP -VRF instances. A common application of the VPN-VRF feature is to +of the default VRF and VPN). A shortcut syntax is also available for +specifying leaking from one vrf to another vrf using the VPN RIB as +the intemediary. A common application of the VPN-VRF feature is to connect a customer's private routing domain to a provider's VPN service. Leaking is configured from the point of view of an individual VRF: ``import`` refers to routes leaked from VPN to a unicast VRF, whereas ``export`` refers to @@ -1587,7 +1588,8 @@ routing domain which is shared across all its sites. More complex routing topologies are possible through use of additional route-targets to augment the leaking of sets of routes in various ways. -For direct VRF to VRF leaking the RD and RT are auto-derived. +When using the shortcut syntax for vrf-to-vrf leaking, the RD and RT are +auto-derived. Configuration ------------- @@ -1673,13 +1675,21 @@ address-family: .. index:: import vrf VRFNAME .. clicmd:: import vrf VRFNAME - Enables direct importation of VRF routes to another VRF. The RD and RT - are auto derived and are not needed for VRF - VRF route leaking. + Shortcut syntax for specifying automatic leaking from vrf VRFNAME to + the current VRF using the VPN RIB as intermediary. The RD and RT + are auto derived and should not be specified explicitly for either the + source or destination VRF's. + + This shortcut syntax mode is not compatible with the explicit + `import vpn` and `export vpn` statements for the two VRF's involved. + The CLI will disallow attempts to configure incompatible leaking + modes. .. index:: no import vrf VRFNAME .. clicmd:: no import vrf VRFNAME - Disables direct VRF to VRF route leaking. + Disables automatic leaking from vrf VRFNAME to the current VRF using + the VPN RIB as intermediary. .. _displaying-bgp-information: |