doc: add more information about show ip bgp and show bgp

Add some information to inform the user that one can either display ipv4
or ipv6 routing table, with the above commands.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index 0fb27441b21188aa484b811ce5ab785164f8ee69..579b0b6497edeee2f0909af0962b8da281409ff3 100644 (file)
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -1783,8 +1783,8 @@ kernel routing tables.
        neighbor 10.0.0.3 remote-as 4
        neighbor 10.0.0.4 remote-as 5
 
-.. index:: show ip bgp view NAME
-.. clicmd:: show ip bgp view NAME
+.. index:: show [ip] bgp view NAME
+.. clicmd:: show [ip] bgp view NAME
 
    Display the routing table of BGP view ``NAME``.
 
@@ -1981,17 +1981,27 @@ Other BGP Commands
 Displaying BGP Information
 ==========================
 
+The following four commands display the IPv6 and IPv4 routing tables, depending
+on whether or not the ``ip`` keyword is used.
+Actually, :clicmd:`show ip bgp` command was used on older `Quagga` routing
+daemon project, while :clicmd:`show bgp` command is the new format. The choice
+has been done to keep old format with IPv4 routing table, while new format
+displays IPv6 routing table.
+
 .. index:: show ip bgp
 .. clicmd:: show ip bgp
 
 .. index:: show ip bgp A.B.C.D
 .. clicmd:: show ip bgp A.B.C.D
 
-.. index:: show ip bgp X:X::X:X
-.. clicmd:: show ip bgp X:X::X:X
+.. index:: show bgp
+.. clicmd:: show bgp
+
+.. index:: show bgp X:X::X:X
+.. clicmd:: show bgp X:X::X:X
 
    These commands display BGP routes. When no route is specified, the default
-   is to display all IPv4 BGP routes.
+   is to display all BGP routes.
 
    ::
 
@@ -2004,31 +2014,56 @@ Displaying BGP Information
 
          Total number of prefixes 1
 
-.. index:: show ip bgp regexp LINE
-.. clicmd:: show ip bgp regexp LINE
+Some other commands provide additional options for filtering the output.
+
+.. index:: show [ip] bgp regexp LINE
+.. clicmd:: show [ip] bgp regexp LINE
 
    This command displays BGP routes using AS path regular expression
    (:ref:`bgp-regular-expressions`).
 
-.. index:: show bgp <ipv4|ipv6> summary
-.. clicmd:: show bgp <ipv4|ipv6> summary
+.. index:: show [ip] bgp summary
+.. clicmd:: show [ip] bgp summary
 
    Show a bgp peer summary for the specified address family.
 
-.. index:: show bgp <ipv4|ipv6> neighbor [PEER]
-.. clicmd:: show bgp <ipv4|ipv6> neighbor [PEER]
+The old command structure :clicmd:`show ip bgp` may be removed in the future
+and should no longer be used. In order to reach the other BGP routing tables
+other than the IPv6 routing table given by :clicmd:`show bgp`, the new command
+structure is extended with :clicmd:`show bgp [afi] [safi]`.
+
+.. index:: show bgp [afi] [safi]
+.. clicmd:: show bgp [afi] [safi]
+
+.. index:: show bgp <ipv4|ipv6> <unicast|multicast|vpn|labeled-unicast>
+.. clicmd:: show bgp <ipv4|ipv6> <unicast|multicast|vpn|labeled-unicast>
+
+   These commands display BGP routes for the specific routing table indicated by
+   the selected afi and the selected safi. If no afi and no safi value is given,
+   the command falls back to the default IPv6 routing table
+
+.. index:: show bgp [afi] [safi] summary
+.. clicmd:: show bgp [afi] [safi] summary
+
+   Show a bgp peer summary for the specified address family, and subsequent
+   address-family.
+
+.. index:: show bgp [afi] [safi] neighbor [PEER]
+.. clicmd:: show bgp [afi] [safi] neighbor [PEER]
 
-   This command shows information on a specific BGP `peer`.
+   This command shows information on a specific BGP peer of the relevant
+   afi and safi selected.
 
-.. index:: show bgp <ipv4|ipv6> dampening dampened-paths
-.. clicmd:: show bgp <ipv4|ipv6> dampening dampened-paths
+.. index:: show bgp [afi] [safi] dampening dampened-paths
+.. clicmd:: show bgp [afi] [safi] dampening dampened-paths
 
-   Display paths suppressed due to dampening.
+   Display paths suppressed due to dampening of the selected afi and safi
+   selected.
 
-.. index:: show bgp <ipv4|ipv6> dampening flap-statistics
-.. clicmd:: show bgp <ipv4|ipv6> dampening flap-statistics
+.. index:: show bgp [afi] [safi] dampening flap-statistics
+.. clicmd:: show bgp [afi] [safi] dampening flap-statistics
 
-   Display flap statistics of routes.
+   Display flap statistics of routes of the selected afi and safi selected.
 
 .. _bgp-display-routes-by-community:
 
@@ -2073,11 +2108,11 @@ Displaying Routes by AS Path
    This commands displays BGP routes that matches a regular
    expression `line` (:ref:`bgp-regular-expressions`).
 
-.. index:: show ip bgp ipv4 vpn
-.. clicmd:: show ip bgp ipv4 vpn
+.. index:: show [ip] bgp ipv4 vpn
+.. clicmd:: show [ip] bgp ipv4 vpn
 
-.. index:: show ip bgp ipv6 vpn
-.. clicmd:: show ip bgp ipv6 vpn
+.. index:: show [ip] bgp ipv6 vpn
+.. clicmd:: show [ip] bgp ipv6 vpn
 
    Print active IPV4 or IPV6 routes advertised via the VPN SAFI.