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diff --git a/docs/configuration/protocols/md-segment-routing.md b/docs/configuration/protocols/md-segment-routing.md deleted file mode 100644 index 45c89a41..00000000 --- a/docs/configuration/protocols/md-segment-routing.md +++ /dev/null @@ -1,359 +0,0 @@ -(segment-routing)= - -# Segment Routing - -Segment Routing (SR) is a network architecture that is similar to source-routing -. In this architecture, the ingress router adds a list of segments, known as -SIDs, to the packet as it enters the network. These segments represent different -portions of the network path that the packet will take. - -The SR segments are portions of the network path taken by the packet, and are -called SIDs. At each node, the first SID of the list is read, executed as a -forwarding function, and may be popped to let the next node read the next SID of -the list. The SID list completely determines the path where the packet is -forwarded. - -Segment Routing can be applied to an existing MPLS-based data plane and defines -a control plane network architecture. In MPLS networks, segments are encoded as -MPLS labels and are added at the ingress router. These MPLS labels are then -exchanged and populated by Interior Gateway Protocols (IGPs) like IS-IS or OSPF -which are running on most ISPs. - -:::{note} -Segment routing defines a control plane network architecture and -can be applied to an existing MPLS based dataplane. In the MPLS networks, -segments are encoded as MPLS labels and are imposed at the ingress router. -MPLS labels are exchanged and populated by IGPs like IS-IS.Segment Routing -as per RFC8667 for MPLS dataplane. It supports IPv4, IPv6 and ECMP and has -been tested against Cisco & Juniper routers.however,this deployment is still -EXPERIMENTAL for FRR. -::: - -## IS-IS SR Configuration - -Segment routing (SR) is used by the IGP protocols to interconnect network -devices, below configuration shows how to enable SR on IS-IS: - -:::{note} -``Known limitations:`` - -No support for level redistribution (L1 to L2 or L2 to L1) - -No support for binding SID - -No support for SRLB - -Only one SRGB and default SPF Algorithm is supported -::: - -```{cfgcmd} set protocols isis segment-routing global-block high-label-value \<label-value\> - -Set the Segment Routing Global Block i.e. the label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535. -``` - - -```{cfgcmd} set protocols isis segment-routing global-block low-label-value \<label-value\> - -Set the Segment Routing Global Block i.e. the low label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535. -``` - - -```{cfgcmd} set protocols isis segment-routing local-block high-label-value \<label-value\> - -Set the Segment Routing Local Block i.e. the label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535.Segment Routing Local Block, The negative command always -unsets both. -``` - - -```{cfgcmd} set protocols isis segment-routing local-block \<low-label-value \<label-value\> - -Set the Segment Routing Local Block i.e. the low label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535.Segment Routing Local Block, The negative command always -unsets both. -``` - - -```{cfgcmd} set protocols isis segment-routing maximum-label-depth \<1-16\> - -Set the Maximum Stack Depth supported by the router. The value depend of -the MPLS dataplane. -``` - - -```{cfgcmd} set protocols isis segment-routing prefix \<address\> index value \<0-65535\> - -A segment ID that contains an IP address prefix calculated by an IGP in the -service provider core network. Prefix SIDs are globally unique, this value -indentify it -``` - - -```{cfgcmd} set protocols isis segment-routing prefix \<address\> index \<no-php-flag | explicit-null| n-flag-clear\> - -this option allows to configure prefix-sid on SR. The ‘no-php-flag’ means NO -Penultimate Hop Popping that allows SR node to request to its neighbor to -not pop the label. The ‘explicit-null’ flag allows SR node to request to its -neighbor to send IP packet with the EXPLICIT-NULL label. The ‘n-flag-clear’ -option can be used to explicitly clear the Node flag that is set by default -for Prefix-SIDs associated to loopback addresses. This option is necessary -to configure Anycast-SIDs. -``` - -```{opcmd} show isis segment-routing node - - Show detailed information about all learned Segment Routing Nodes -``` - - -```{opcmd} show isis route prefix-sid - -Show detailed information about prefix-sid and label learned -``` - -:::{note} -more information related IGP - {ref}`routing-isis` -::: - - -## OSPF SR Configuration - - -Segment routing (SR) is used by the IGP protocols to interconnect network -devices, below configuration shows how to enable SR on OSPF: - -```{cfgcmd} set protocols ospf parameters opaque-lsa - -Enable the Opaque-LSA capability (rfc2370), necessary to transport label -on IGP -``` - -```{cfgcmd} set protocols ospf segment-routing global-block high-label-value \<label-value\> - -Set the Segment Routing Global Block i.e. the label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535. -``` - -```{cfgcmd} set protocols ospf segment-routing global-block low-label-value \<label-value\> - -Set the Segment Routing Global Block i.e. the low label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535. -``` - -```{cfgcmd} set protocols ospf segment-routing local-block high-label-value \<label-value\> - -Set the Segment Routing Local Block i.e. the label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535.Segment Routing Local Block, The negative command always -unsets both. -``` - -```{cfgcmd} set protocols ospf segment-routing local-block \<low-label-value \<label-value\> - -Set the Segment Routing Local Block i.e. the low label range used by MPLS to -store label in the MPLS FIB for Prefix SID. Note that the block size may -not exceed 65535.Segment Routing Local Block, The negative command always -unsets both. -``` - -```{cfgcmd} set protocols ospf segment-routing maximum-label-depth \<1-16\> - -Set the Maximum Stack Depth supported by the router. The value depend of -the MPLS dataplane. -``` - -```{cfgcmd} set protocols ospf segment-routing prefix \<address\> index value \<0-65535\> - -A segment ID that contains an IP address prefix calculated by an IGP in the -service provider core network. Prefix SIDs are globally unique, this value -indentify it -``` - -```{cfgcmd} set protocols ospf segment-routing prefix \<address\> index \<no-php-flag | explicit-null| n-flag-clear\> - -this option allows to configure prefix-sid on SR. The ‘no-php-flag’ means NO -Penultimate Hop Popping that allows SR node to request to its neighbor to -not pop the label. The ‘explicit-null’ flag allows SR node to request to its -neighbor to send IP packet with the EXPLICIT-NULL label. The ‘n-flag-clear’ -option can be used to explicitly clear the Node flag that is set by default -for Prefix-SIDs associated to loopback addresses. This option is necessary -to configure Anycast-SIDs. -``` - -:::{note} -more information related IGP - {ref}`routing-ospf` -::: - -## Configuration Example - -we described the configuration SR ISIS / SR OSPF using 2 connected with them to -share label information. - -### Enable IS-IS with Segment Routing (Experimental) - -**Node 1:** - -```none -set interfaces loopback lo address '192.168.255.255/32' -set interfaces ethernet eth1 address '192.0.2.1/24' - -set protocols isis interface eth1 -set protocols isis interface lo -set protocols isis net '49.0001.1921.6825.5255.00' -set protocols isis segment-routing global-block high-label-value '599' -set protocols isis segment-routing global-block low-label-value '550' -set protocols isis segment-routing prefix 192.168.255.255/32 index value '1' -set protocols isis segment-routing prefix 192.168.255.255/32 index explicit-null -set protocols mpls interface 'eth1' -``` - -**Node 2:** - -```none -set interfaces loopback lo address '192.168.255.254/32' -set interfaces ethernet eth1 address '192.0.2.2/24' - -set protocols isis interface eth1 -set protocols isis interface lo -set protocols isis net '49.0001.1921.6825.5254.00' -set protocols isis segment-routing global-block high-label-value '599' -set protocols isis segment-routing global-block low-label-value '550' -set protocols isis segment-routing prefix 192.168.255.254/32 index value '2' -set protocols isis segment-routing prefix 192.168.255.254/32 index explicit-null -set protocols mpls interface 'eth1' -``` - -This gives us MPLS segment routing enabled and labels for far end loopbacks: - -```none -Node-1@vyos:~$ show mpls table - Inbound Label Type Nexthop Outbound Label - ---------------------------------------------------------------------- - 552 SR (IS-IS) 192.0.2.2 IPv4 Explicit Null <-- Node-2 loopback learned on Node-1 - 15000 SR (IS-IS) 192.0.2.2 implicit-null - 15001 SR (IS-IS) fe80::e87:6cff:fe09:1 implicit-null - 15002 SR (IS-IS) 192.0.2.2 implicit-null - 15003 SR (IS-IS) fe80::e87:6cff:fe09:1 implicit-null - -Node-2@vyos:~$ show mpls table - Inbound Label Type Nexthop Outbound Label - --------------------------------------------------------------------- - 551 SR (IS-IS) 192.0.2.1 IPv4 Explicit Null <-- Node-1 loopback learned on Node-2 - 15000 SR (IS-IS) 192.0.2.1 implicit-null - 15001 SR (IS-IS) fe80::e33:2ff:fe80:1 implicit-null - 15002 SR (IS-IS) 192.0.2.1 implicit-null - 15003 SR (IS-IS) fe80::e33:2ff:fe80:1 implicit-null -``` - -Here is the routing tables showing the MPLS segment routing label operations: - -```none -Node-1@vyos:~$ show ip route isis -Codes: K - kernel route, C - connected, S - static, R - RIP, - O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP, - T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR, - f - OpenFabric, - > - selected route, * - FIB route, q - queued, r - rejected, b - backup - t - trapped, o - offload failure - -I 192.0.2.0/24 [115/20] via 192.0.2.2, eth1 inactive, weight 1, 00:07:48 -I>* 192.168.255.254/32 [115/20] via 192.0.2.2, eth1, label IPv4 Explicit Null, weight 1, 00:03:39 - -Node-2@vyos:~$ show ip route isis -Codes: K - kernel route, C - connected, S - static, R - RIP, - O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP, - T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR, - f - OpenFabric, - > - selected route, * - FIB route, q - queued, r - rejected, b - backup - t - trapped, o - offload failure - -I 192.0.2.0/24 [115/20] via 192.0.2.1, eth1 inactive, weight 1, 00:07:46 -I>* 192.168.255.255/32 [115/20] via 192.0.2.1, eth1, label IPv4 Explicit Null, weight 1, 00:03:43 -``` - - -### Enable OSPF with Segment Routing (Experimental): - -**Node 1** - -```none -set interfaces loopback lo address 10.1.1.1/32 -set interfaces ethernet eth0 address 192.168.0.1/24 -set protocols ospf area 0 network '192.168.0.0/24' -set protocols ospf area 0 network '10.1.1.1/32' -set protocols ospf parameters opaque-lsa -set protocols ospf parameters router-id '10.1.1.1' -set protocols ospf segment-routing global-block high-label-value '1100' -set protocols ospf segment-routing global-block low-label-value '1000' -set protocols ospf segment-routing prefix 10.1.1.1/32 index explicit-null -set protocols ospf segment-routing prefix 10.1.1.1/32 index value '1' -``` - -**Node 2** - -```none -set interfaces loopback lo address 10.1.1.2/32 -set interfaces ethernet eth0 address 192.168.0.2/24 -set protocols ospf area 0 network '192.168.0.0/24' -set protocols ospf area 0 network '10.1.1.2/32' -set protocols ospf parameters opaque-lsa -set protocols ospf parameters router-id '10.1.1.2' -set protocols ospf segment-routing global-block high-label-value '1100' -set protocols ospf segment-routing global-block low-label-value '1000' -set protocols ospf segment-routing prefix 10.1.1.2/32 index explicit-null -set protocols ospf segment-routing prefix 10.1.1.2/32 index value '2' -``` - -This gives us MPLS segment routing enabled and labels for far end loopbacks: - -```none -Node-1@vyos:~$ show mpls table - Inbound Label Type Nexthop Outbound Label - ----------------------------------------------------------- - 1002 SR (OSPF) 192.168.0.2 IPv4 Explicit Null <-- Node-2 loopback learned on Node-1 - 15000 SR (OSPF) 192.168.0.2 implicit-null - 15001 SR (OSPF) 192.168.0.2 implicit-null - -Node-2@vyos:~$ show mpls table - Inbound Label Type Nexthop Outbound Label - ----------------------------------------------------------- - 1001 SR (OSPF) 192.168.0.1 IPv4 Explicit Null <-- Node-1 loopback learned on Node-2 - 15000 SR (OSPF) 192.168.0.1 implicit-null - 15001 SR (OSPF) 192.168.0.1 implicit-null -``` - -Here is the routing tables showing the MPLS segment routing label operations: - -```none -Node-1@vyos:~$ show ip route ospf -Codes: K - kernel route, C - connected, S - static, R - RIP, - O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP, - T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR, - f - OpenFabric, - > - selected route, * - FIB route, q - queued, r - rejected, b - backup - t - trapped, o - offload failure - -O 10.1.1.1/32 [110/0] is directly connected, lo, weight 1, 00:03:43 -O>* 10.1.1.2/32 [110/1] via 192.168.0.2, eth0, label IPv4 Explicit Null, weight 1, 00:03:32 -O 192.168.0.0/24 [110/1] is directly connected, eth0, weight 1, 00:03:43 - -Node-2@vyos:~$ show ip route ospf -Codes: K - kernel route, C - connected, S - static, R - RIP, - O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP, - T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR, - f - OpenFabric, - > - selected route, * - FIB route, q - queued, r - rejected, b - backup - t - trapped, o - offload failure - -O>* 10.1.1.1/32 [110/1] via 192.168.0.1, eth0, label IPv4 Explicit Null, weight 1, 00:03:36 -O 10.1.1.2/32 [110/0] is directly connected, lo, weight 1, 00:03:51 -O 192.168.0.0/24 [110/1] is directly connected, eth0, weight 1, 00:03:51 -``` |