https://www.ietf.org/id/draft-ietf-bess-ipv6-only-pe-design-00.html#name-test-3-e2e-ipv6-only-pe-ce-
5.3. Test-3 E2E IPv6-Only PE-CE, Global Table over IPv6-Only Core (4PE), 4to6 Softwire
________
IPv6-Only _____ / \ IPv6-Only
PE / CE / \__/ \___ PE / CE
+----+ +----+ / \ +------+ +-----+
| | | | | |_ | | | |
| | | | | \ | | | |
| CE |--| PE |--\ IPv6-Only Core |----| PE |---| CE |
| | | | \0=========Underlay =======0| | | | |
+----+ +----+ \ __/ +------+ +-----+
IPv6 BGP peer \ MPLS / SR domain / IPv6 BGP peer
IPv4 forwarding \__ __ / IPv4 forwarding
IPv6 forwarding \_______/ \_____/ IPv6 forwarding
Cisco, Juniper, Arista, Nokia, Huawei code and platform and test results.
Cisco: Edge Router- XR ASR 9910 IOS XR 7.4.1, Core Router- NCS 6000 7.2.2, CRS-X 6.7.4
Juniper: Edge Router- MX platform MX480, MX960, Core Router- PTX Platform PTX5000, PTC10K8 (JUNOS and EVO) Release 20.4R2
Tested v4 edge over v6 core in a virtual setup using vMX platforrm and 20.4R2 and LDPv6 as underlay, but there were some data plane forwarding issues. Tested same setup on latest release 21.4 and it worked. Investigating what the minimum version is for this setup to work.
Arista:
Nokia: Edge and Core-7750 Service Router, Release R21
Huawei: Edge and Core-VRPv8, Release VRP-V800R020C10
According to the description in this article, the current ios-xr system can achieve 4PE
I used the following platforms for testing：
Build Information: Built By : ingunawa Built On : Wed Aug 4 04:18:28 PDT 2021 Built Host : iox-ucs-012 Workspace : /auto/srcarchive17/prod/7.4.1/xrv9k/ws Version : 7.4.1 Location : /opt/cisco/XR/packages/ Label : 7.4.1-0
Here is the topology diagram:
configurations:
hostname PE1 logging console informational ! interface Loopback0 ipv6 address 2001:db8:cafe:aaaa::1/128 ! interface GigabitEthernet0/0/0/1 ipv6 enable ! interface GigabitEthernet0/0/0/2 ipv4 address 10.224.72.1 255.255.255.0 ! router isis underlay is-type level-2-only net 49.0192.0168.0255.0001.00 log adjacency changes address-family ipv6 unicast metric-style wide segment-routing mpls ! interface Loopback0 address-family ipv6 unicast prefix-sid index 1 ! ! interface GigabitEthernet0/0/0/1 address-family ipv6 unicast ! ! ! end
hostname P ! interface Loopback0 ipv6 address 2001:db8:cafe:bbbb::1/128 ! interface GigabitEthernet0/0/0/1 ipv6 enable ! interface GigabitEthernet0/0/0/2 ipv6 enable ! router isis underlay is-type level-2-only net 49.0192.0168.0255.0002.00 log adjacency changes address-family ipv6 unicast metric-style wide segment-routing mpls ! interface Loopback0 address-family ipv6 unicast prefix-sid index 2 ! ! interface GigabitEthernet0/0/0/1 address-family ipv6 unicast ! ! interface GigabitEthernet0/0/0/2 address-family ipv6 unicast ! ! ! end
hostname PE2 logging console informational ! interface Loopback0 ipv6 address 2001:db8:cafe:cccc::1/128 ! interface GigabitEthernet0/0/0/1 ipv6 enable ! interface GigabitEthernet0/0/0/2 ipv4 address 10.224.4.1 255.255.255.0 ! router isis underlay is-type level-2-only net 49.0192.0168.0255.0003.00 log adjacency changes address-family ipv6 unicast metric-style wide segment-routing mpls ! interface Loopback0 address-family ipv6 unicast prefix-sid index 3 ! ! interface GigabitEthernet0/0/0/1 address-family ipv6 unicast ! ! ! end
mpls forwarding table on PE1:
RP/0/RP0/CPU0:PE1#show mpls forwarding
Wed Dec 1 07:56:33.239 UTC
Local Outgoing Prefix Outgoing Next Hop Bytes
Label Label or ID Interface Switched
------ ----------- ------------------ ------------ --------------- ------------
16002 Pop SR Pfx (idx 2) Gi0/0/0/1 fe80::5209:abff:fe00:704 \
10282
16003 16003 SR Pfx (idx 3) Gi0/0/0/1 fe80::5209:abff:fe00:704 \
3970
24000 Pop SR Adj (idx 1) Gi0/0/0/1 fe80::5209:abff:fe00:704 \
0
24001 Pop SR Adj (idx 3) Gi0/0/0/1 fe80::5209:abff:fe00:704 \
0 When I try to commit bgp configuration on PE1 , I got an error
router bgp 64512 bgp router-id 192.168.255.1 bgp log neighbor changes detail address-family ipv4 unicast redistribute connected allocate-label all ! address-family ipv6 unicast ! neighbor-group 4PE remote-as 64512 update-source Loopback0 address-family ipv4 labeled-unicast ! ! neighbor 2001:db8:cafe:cccc::1 use neighbor-group 4PE ! !
% Failed to commit one or more configuration items during a pseudo-atomic operation. Al l changes made have been reverted. Please issue 'show configuration failed [inheritance ]' from this session to view the errors RP/0/RP0/CPU0:PE1(config-bgp-nbr)#RP/0/RP0/CPU0:Dec 1 07:58:11.791 UTC: bgp[1078]: %RO UTING-BGP-3-INIT_GET_VALUE : Failed to obtain Instance ID: bpm/info/default/inst-id dur ing initialization: 'sysdb' detected the 'warning' condition 'A SysDB client tried to a ccess a nonexistent item or list an empty directory'
Wed Dec 1 07:59:17.924 UTC !! SEMANTIC ERRORS: This configuration was rejected by !! the system due to semantic errors. The individual !! errors with each failed configuration command can be !! found below. router bgp 64512 neighbor-group 4PE address-family ipv4 labeled-unicast !!% Change would result in neighbor (2001:db8:cafe:cccc::1) being activated with an invalid address family
What caused this?
