[PATCH] doc: Update VRF documentation metric
From: Donald Sharp <hidden>
Date: 2017-10-18 14:24:37
Subsystem:
documentation, networking [general], the rest · Maintainers:
Jonathan Corbet, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Two things: 1) Update examples to show usage of metric 2) Discuss reasoning for using such a high metric. Signed-off-by: Donald Sharp <redacted> --- Documentation/networking/vrf.txt | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/Documentation/networking/vrf.txt b/Documentation/networking/vrf.txt
index 3918dae..8ff7b4c 100644
--- a/Documentation/networking/vrf.txt
+++ b/Documentation/networking/vrf.txt@@ -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 }
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2.9.5