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doc: Update VRF documentation metric

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Two things:

1) Update examples to show usage of metric
2) Discuss reasoning for using such a high metric.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Donald Sharp 2017-10-18 10:24:28 -04:00 committed by David S. Miller
parent 9854d758f7
commit 17c918840f
1 changed files with 9 additions and 4 deletions
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13
Documentation/networking/vrf.txt
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@ -71,7 +71,12 @@ Setup
ip ru add iif vrf-blue table 10
3. Set the default route for the table (and hence default route for the VRF).
ip route add table 10 unreachable default
ip route add table 10 unreachable default metric 4278198272
This high metric value ensures that the default unreachable route can
be overridden by a routing protocol suite. FRRouting interprets
kernel metrics as a combined admin distance (upper byte) and priority
(lower 3 bytes). Thus the above metric translates to [255/8192].
4. Enslave L3 interfaces to a VRF device.
ip link set dev eth1 master vrf-blue
@ -256,7 +261,7 @@ older form without it.
For example:
$ ip route show vrf red
prohibit default
unreachable default metric 4278198272
broadcast 10.2.1.0 dev eth1 proto kernel scope link src 10.2.1.2
10.2.1.0/24 dev eth1 proto kernel scope link src 10.2.1.2
local 10.2.1.2 dev eth1 proto kernel scope host src 10.2.1.2
@ -282,7 +287,7 @@ older form without it.
ff00::/8 dev red metric 256 pref medium
ff00::/8 dev eth1 metric 256 pref medium
ff00::/8 dev eth2 metric 256 pref medium
unreachable default dev lo metric 4278198272 error -101 pref medium
8. Route Lookup for a VRF
@ -331,7 +336,7 @@ function vrf_create
ip link add ${VRF} type vrf table ${TBID}
if [ "${VRF}" != "mgmt" ]; then
ip route add table ${TBID} unreachable default
ip route add table ${TBID} unreachable default metric 4278198272
fi
ip link set dev ${VRF} up
}