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StefanoSalsanoStefanoSalsano
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Merged fix-8routers into master
* add seg6_enabled=1 via sysctl for all routers * change loopback subnet from /128 to /32 for all routers * remove the propagation for routes fd00:: by isis
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‎nets/8routers-isis-ipv6/README.md

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SMART INTRODUCTION LINK ---> https://drive.google.com/file/d/18PumHFw6o3df5-_yPtOVw4Zem8RDEjTr/view?usp=sharing
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```text
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In folder nodeconf/
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- for each host and router one folder
@@ -61,9 +61,67 @@ router - router links:
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r6 -r7: fcf0:0:6:7::1/64 r7 - r6: fcf0:0:6:7::2/64
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r6 -r8: fcf0:0:6:8::1/64 r8 - r6: fcf0:0:6:8::2/64
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r7 -r8: fcf0:0:7:8::1/64 r8 - r7: fcf0:0:7:8::2/64
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router localhost
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r1 fcff:1::1
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r2 fcff:2::1
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r3 fcff:3::1
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r4 fcff:4::1
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r5 fcff:5::1
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r6 fcff:6::1
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r7 fcff:7::1
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r8 fcff:8::1
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( The addressing plan is explained in https://docs.google.com/document/d/15giV53fH_eDuWadOxzjPVzlr-a7Rn65MpCbz9QKs7JI/edit )
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------Tunnel examples -------------
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1) Create a bidirectional tunnel between h11 and h83, passing through router r4
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1.1) set tunnel from r1 to r8 for fd00:0:83::/64
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on r1: ip -6 route add fd00:0:83::/64 encap seg6 mode encap segs fcff:4::1,fcff:8::1 dev r1-h11
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on r8: no explicit decap instruction is needed because net.ipv6.conf.*.seg6_enabled=1
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1.2) set tunnel from r8 to r1 for fd00:0:11::/64
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on r8: ip -6 route add fd00:0:11::/64 encap seg6 mode encap segs fcff:4::1,fcff:1::1 dev r8-h83
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on r1: no explicit decap instruction is needed because net.ipv6.conf.*.seg6_enabled=1
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after the tunnel is setup, you can ping from h11 to h83 and viceversa
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h11# ping6 fd00:0:83::2
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h83# ping6 fd00:0:11::2
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on recent versions of Linux kernel (>=5.5) it is also possible to ping the router IP address on
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the interface with the host, while on previous ones it was not possible due to a bug in the SRv6
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implementation:
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h11# ping6 fd00:0:83::1
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Note that this is not the suggested approach, the explicit configuration of decap instruction
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is preferred, as described hereafter
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we use a decap SID in r8 and in r1 with the End.DT6 behavior, the SID used is fcff:8::100
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1.3) set tunnel from r1 to r8 for fd00:0:83::/64
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on r1: ip -6 route add fd00:0:83::/64 encap seg6 mode encap segs fcff:4::1,fcff:8::100 dev r1-h11
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on r8: ip -6 route add fcff:8::100 encap seg6local action End.DT6 table 254 dev r8-h83
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1.4) set tunnel from r8 to r1 for fd00:0:11::/64
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on r8: ip -6 route add fd00:0:11::/64 encap seg6 mode encap segs fcff:4::1,fcff:1::100 dev r8-h83
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on r1: ip -6 route add fcff:1::100 encap seg6local action End.DT6 table 254 dev r1-h11
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table 254 corresponds to the "main" routing table, using recent version of ip command
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we can use table name instead of table id, for example
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on r8: ip -6 route add fcff:8::100 encap seg6local action End.DT6 table main dev r8-h83
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------ISIS CONFIGURATION-------------
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Install guide and How to get FRR

‎nets/8routers-isis-ipv6/nodeconf/r1/isisd.conf

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password zebra
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log file nodeconf/r1/isisd.log
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!
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interface r1-h11
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!interface r1-h11
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! ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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interface r1-h12
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!interface r1-h12
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!ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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interface r1-h13
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!interface r1-h13
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! ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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interface r1-r2
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ipv6 router isis FOO

‎nets/8routers-isis-ipv6/nodeconf/r1/start.sh

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@@ -25,3 +25,10 @@ $FRR_PATH/zebra -f $PWD/$BASE_DIR/$NODE_NAME/zebra.conf -d -z $PWD/$BASE_DIR/$NO
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sleep 1
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$FRR_PATH/isisd -f $PWD/$BASE_DIR/$NODE_NAME/isisd.conf -d -z $PWD/$BASE_DIR/$NODE_NAME/zebra.sock -i $PWD/$BASE_DIR/$NODE_NAME/isisd.pid
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# enable Segment Routing for IPv6
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sysctl -w net.ipv6.conf.all.seg6_enabled=1
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for dev in $(ip -o -6 a | awk '{ print $2 }' | grep -v "lo")
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do
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sysctl -w net.ipv6.conf.$dev.seg6_enabled=1
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done

‎nets/8routers-isis-ipv6/nodeconf/r1/zebra.conf

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ipv6 address fcf0:0:1:2::1/64
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!
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interface lo
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ipv6 address fcff:1::1/128
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ipv6 address fcff:1::1/32
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!
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ipv6 forwarding
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!

‎nets/8routers-isis-ipv6/nodeconf/r2/start.sh

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sleep 1
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$FRR_PATH/isisd -f $PWD/$BASE_DIR/$NODE_NAME/isisd.conf -d -z $PWD/$BASE_DIR/$NODE_NAME/zebra.sock -i $PWD/$BASE_DIR/$NODE_NAME/isisd.pid
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# enable Segment Routing for IPv6
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sysctl -w net.ipv6.conf.all.seg6_enabled=1
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for dev in $(ip -o -6 a | awk '{ print $2 }' | grep -v "lo")
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do
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sysctl -w net.ipv6.conf.$dev.seg6_enabled=1
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done

‎nets/8routers-isis-ipv6/nodeconf/r2/zebra.conf

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ipv6 address fcf0:0:2:7::1/64
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!
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interface lo
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ipv6 address fcff:2::1/128
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ipv6 address fcff:2::1/32
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!
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ipv6 forwarding
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!

‎nets/8routers-isis-ipv6/nodeconf/r3/isisd.conf

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password zebra
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log file nodeconf/r3/isisd.log
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!
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interface r3-h31
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!
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interface r3-h32
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!
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interface r3-h33
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ipv6 router isis FOO
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ip router isis FOO
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isis hello-interval 5
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!interface r3-h31
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!ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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!interface r3-h32
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!ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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!interface r3-h33
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!ipv6 router isis FOO
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! ip router isis FOO
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! isis hello-interval 5
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!
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interface r3-r2
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ipv6 router isis FOO

‎nets/8routers-isis-ipv6/nodeconf/r3/start.sh

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sleep 1
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$FRR_PATH/isisd -f $PWD/$BASE_DIR/$NODE_NAME/isisd.conf -d -z $PWD/$BASE_DIR/$NODE_NAME/zebra.sock -i $PWD/$BASE_DIR/$NODE_NAME/isisd.pid
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# enable Segment Routing for IPv6
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sysctl -w net.ipv6.conf.all.seg6_enabled=1
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for dev in $(ip -o -6 a | awk '{ print $2 }' | grep -v "lo")
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do
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sysctl -w net.ipv6.conf.$dev.seg6_enabled=1
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done

‎nets/8routers-isis-ipv6/nodeconf/r3/zebra.conf

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ipv6 address fcf0:0:3:4::1/64
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!
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interface lo
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ipv6 address fcff:3::1/128
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ipv6 address fcff:3::1/32
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!
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ipv6 forwarding
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!

‎nets/8routers-isis-ipv6/nodeconf/r4/start.sh

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sleep 1
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$FRR_PATH/isisd -f $PWD/$BASE_DIR/$NODE_NAME/isisd.conf -d -z $PWD/$BASE_DIR/$NODE_NAME/zebra.sock -i $PWD/$BASE_DIR/$NODE_NAME/isisd.pid
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# enable Segment Routing for IPv6
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sysctl -w net.ipv6.conf.all.seg6_enabled=1
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for dev in $(ip -o -6 a | awk '{ print $2 }' | grep -v "lo")
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do
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sysctl -w net.ipv6.conf.$dev.seg6_enabled=1
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done

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