Possibly inadvertent script in LDP/LDP/guide/docbook/linux-ip/scripts/copy-routing-table.sh

[huangy7]

# - - - - - - - - - - -
  copy_routing_table () {
# - - - - - - - - - - -
#
# -- accepts one paramater:
#
#    $1:  table identifier for the routing table to create
#
  test "$#" -lt "1"     && return
  DTABLE=$1

  test "$#" -gt "1"     && STABLE="$2"
  test "$STABLE" = ""   && STABLE="main"

  ip route flush table $DTABLE
  ip route show table $STABLE | grep -Ev '^default' \
    | while read ROUTE ; do
      ip route add table $DTABLE $ROUTE
  done

}

It will not work when an equivalent route exists in the routing table, For example:

[root@k8s-master topo_build]# ip route show
1.1.1.1 proto 188 metric 20 
	nexthop via 10.0.0.2 dev tun1 weight 1 
	nexthop via 10.0.2.2 dev tun3 weight 1 
2.0.0.2 proto 188 metric 20 
	nexthop via 10.0.1.2 dev tun2 weight 1 
	nexthop via 10.0.3.2 dev tun4 weight 1 

it will not work when we take routing in this way, It splits a route that occupies three rows into three routes...

[root@k8s-master topo_build]# ip route show | while read ROUTE; do echo [${i}]  $ROUTE; let i++; done
[] 1.1.1.1 proto 188 metric 20
[1] nexthop via 10.0.0.2 dev tun1 weight 1
[2] nexthop via 10.0.2.2 dev tun3 weight 1
[3] 2.0.0.2 proto 188 metric 20
[4] nexthop via 10.0.1.2 dev tun2 weight 1
[5] nexthop via 10.0.3.2 dev tun4 weight 1

[huangy7]

But I haven't thought of a solution yet.