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[Multi-asic] Fixed IPv6 Default Route to be BGP Learned #5548

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Oct 6, 2020
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[Multi-asic] Fixed IPv6 Default Route to be BGP Learned #5548

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17 changes: 12 additions & 5 deletions dockers/docker-fpm-frr/docker_init.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -17,27 +17,34 @@ CFGGEN_PARAMS=" \
"
CONFIG_TYPE=$(sonic-cfggen $CFGGEN_PARAMS)

if [[ ! -z "$NAMESPACE_ID" ]]; then
update_default_gw()
{
IP_VER=${1}
# FRR is not running in host namespace so we need to delete
# default gw kernel route added by docker network via eth0 and add it back
# with higher administrative distance so that default route learnt
# by FRR becomes best route if/when available
GATEWAY_IP=$(ip route show 0.0.0.0/0 dev eth0 | awk '{print $3}')
GATEWAY_IP=$(ip -${IP_VER} route show default dev eth0 | awk '{print $3}')
#Check if docker default route is there
if [[ ! -z "$GATEWAY_IP" ]]; then
ip route del 0.0.0.0/0 dev eth0
ip -${IP_VER} route del default dev eth0
#Make sure route is deleted
CHECK_GATEWAY_IP=$(ip route show 0.0.0.0/0 dev eth0 | awk '{print $3}')
CHECK_GATEWAY_IP=$(ip -${IP_VER} route show default dev eth0 | awk '{print $3}')
if [[ -z "$CHECK_GATEWAY_IP" ]]; then
# Ref: http://docs.frrouting.org/en/latest/zebra.html#zebra-vrf
# Zebra does treat Kernel routes as special case for the purposes of Admin Distance. \
# Upon learning about a route that is not originated by FRR we read the metric value as a uint32_t.
# The top byte of the value is interpreted as the Administrative Distance and
# the low three bytes are read in as the metric.
# so here we are programming administrative distance of 210 (210 << 24) > 200 (for routes learnt via IBGP)
ip route add 0.0.0.0/0 via $GATEWAY_IP dev eth0 metric 3523215360
ip -${IP_VER} route add default via $GATEWAY_IP dev eth0 metric 3523215360
fi
fi
}

if [[ ! -z "$NAMESPACE_ID" ]]; then
update_default_gw 4
update_default_gw 6
fi

if [ -z "$CONFIG_TYPE" ] || [ "$CONFIG_TYPE" == "separated" ]; then
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