To complete the network configuration for the new codfw switches in row's C and D we need to migrate the uplinks from the current //asw-c-codfw// and //asw-d-codfw// virtual-chassis so they terminate on the new Spine swithces in row D instead of directly on the core routers.
We need to wait until we have the transceivers installed on the links between spines and CRs before we kick off (see T360789).
This is quite a delicate change but should be possible without causing any interruption to service. It may make sense to do a dns depool of the site in advance as a precaution and to reduce traffic levels (as at many points we will be on 1 leg rather than 2). Steps are roughly as follows:
**In advance**:
# Create ESI-LAG ae0 on both spine switches, with single member port, et-0/0/28, on each (for asw-c)
# Create ESI-LAG ae1 on both spine switches, with single member port, et-0/0/27, on each (for asw-d)
# Add the current set of vlans in use on asw-c-codfw and asw-d-codfw to //ssw1-d1-codfw// and //ssw1-d8-codfw//
# Trunk those vlans over //ssw1-d8-codfw// port et-0/0/31towards cr2-codfw
# Trunk the row C vlans over ae0 on the spines
# Trunk the row D vlans over ae1 on the spines
**On day of move:**
{F55318490}
1. Change the VRRP priority on //cr2-codfw// so that it is VRRP master for the row C vlans
2. Disable interfaces et-1/1/0 and ae3 on //cr1-codfw// (ports facing //asw-c-codfw//)
** Inbound and outbound traffic to row C still flows from //cr2-codfw// et-1/1/0 to //asw-c7-codfw// et-7/0/52
{F55318497}
3. Re-cable //asw-c2-codfw// et-2/0/51 to //ssw1-d1-codfw// et-0/0/28
{F55318499}
4. Check row C MAC addresses are learnt on ssw1-d1-codfw ae0 and known on ssw1-d8-codfw via evpn
5. Change the VRRP priority on //cr2-codfw// so that it is VRRP master for the row D vlans
6. Disable interfaces et-1/1/3 and ae4 on //cr1-codfw// (ports facing //asw-d-codfw//)
** Inbound and outbound traffic to row D still flows from //cr2-codfw// et-1/1/3 to //asw-c7-codfw// et-7/0/52
{F55318504}
7. Re-cable //asw-d2-codfw// et-2/0/51 to //ssw1-d1-codfw// et-0/0/27
{F55318509}
8. Check row D MAC addresses are learnt on ssw1-d1-codfw ae1 and known on //ssw1-d8-codfw//via evpn
9. Drain transport circuits to //cr3-eqsin// and //cr1-eqiad// on //cr1-codfw//
10. Deactivate Arelion transit on //cr1-codfw// xe-1/0/1:0
11. Reconfigure PIC 1/0 on //cr1-codfw//
** Delete the 40G configuration for ports 0 and 3
** Add a 100G configuration for port 2
12. Reset PIC 1/0 on cr1-codfw
13. Un-drain transport circuits to //cr3-eqsin// and //cr1-eqiad// on //cr1-codfw//
14. Re-activate Arelion transit on //cr1-codfw// xe-1/0/1:0
15. Enable //cr1-codfw// et-1/0/2 in Netbox (connects to ssw1-d1-codfw) and push with Homer
16. Move the //cr1-codfw// ae3 and ae4 vlan sub-interfaces to et-1/0/2
17. Add the new sub-ints of et-1/0/2 as OSPF stub interfaces, remove the old ae3/ae4 sub-ints from OSPF
18. Check on cr2-codfw that it now sees cr1-codfw as VRRP backup for all vlans again
** L2 path here is from cr2-codfw -> asw -> ssw -> cr1-codfw
{F55318513}
19. Reconfigure the cr1-codfw new sub-interfaces so it they are VRRP masters for row C vlans
{F55318523}
20. Disable //cr2-codfw// et-1/1/0 and ae3 (ports facing //asw-c-codfw//)
{F55318526}
21. Move //cr2-codfw// ae3 sub-interface configs to et-1/0/2 (port facing //ssw1-d8-codfw//)
22. Check on //cr1-codfw// that it sees //cr2-codfw// as VRRP backup for row C vlans again
** L2 path here is from cr1-codfw -> ssw1-d1 -> ssw1-d8 -> cr2-codfw
{F55318530}
# Re-cable //asw-c7-codfw// et-7/0/52 to //ssw1-d8-codfw// et-0/0/28 (had been going to cr2)
# Reconfigure //asw-c-codfw// et-7/0/52 so it is part of ae1, and delete ae2 config
# Check ESI-LAG on et-0/0/28 of both spines is working and ae1 up on spines and asw-c-codfw
{F55318539}
# Reconfigure the cr1-codfw new sub-interfaces so they are VRRP masters for row D vlans
# Disable //cr2-codfw// et-1/1/3 and ae4 (ports facing //asw-d-codfw//)
# Move //cr2-codfw// ae4 sub-interface configs to et-1/0/2 (port facing //ssw1-d8-codfw//)
# Check on //cr1-codfw// that it sees //cr2-codfw// as VRRP backup for row D vlans again
## L2 path here is from cr1-codfw -> ssw1-d1 -> ssw1-d8 -> cr2-codfw
{F55318550}
# Re-cable //asw-d7-codfw// et-7/0/52 to //ssw1-d8-codfw// et-0/0/27 (had been going to cr2)
# Reconfigure //asw-d-codfw// et-7/0/52 so it is part of ae1, and delete ae2 config
# Check ESI-LAG on et-0/0/27 of both spines is working and ae2 up (spines) and ae1 up (//asw-d-codfw//)
{F55318552}
# Re-balance VRRP settings on both CRs as they had been prior to start