Hi there!
I am playing around with SR MPLS in my VIRL lab, and hit some problems.
My setup is the following:
- 4 IOS-XR connected in a circle
- ipv6 only loopback address with prefix ID
- ISIS as routing protocol
- ipv6 link local addresses only on connecting interfaces
!
interface Loopback0
ipv6 address 2001:db8::1/128
!
interface GigabitEthernet0/0/0/0
ipv6 enable
!
interface GigabitEthernet0/0/0/1
ipv6 enable
!
router isis 1
is-type level-2-only
net 49.0000.0000.0000.0001.00
address-family ipv6 unicast
metric-style wide
segment-routing mpls
!
interface Loopback0
passive
address-family ipv6 unicast
prefix-sid index 1
!
!
interface GigabitEthernet0/0/0/0
point-to-point
address-family ipv6 unicast
!
!
interface GigabitEthernet0/0/0/1
point-to-point
address-family ipv6 unicast
!
!
segment-routing
!
The other 3 routers are configured the same way.
In the routers in my VIRL lab I see Unlabelled Prefix IDs to the router, which is one hop away:
R1#sh mpls forwarding
Mon Aug 27 11:00:10.087 UTC
Local Outgoing Prefix Outgoing Next Hop Bytes
Label Label or ID Interface Switched
------ ----------- ------------------ ------------ --------------- ------------
16002 Pop SR Pfx (idx 2) Gi0/0/0/0 fe80::f816:3eff:fec4:d286 \
0
16007 Pop SR Pfx (idx 7) Gi0/0/0/4 fe80::f816:3eff:fea9:f6c0 \
0
16008 Unlabelled SR Pfx (idx 8) Gi0/0/0/0 fe80::f816:3eff:fec4:d286 \
0
Unlabelled SR Pfx (idx 8) Gi0/0/0/4 fe80::f816:3eff:fea9:f6c0 \
0
24000 Pop SR Adj (idx 1) Gi0/0/0/0 fe80::f816:3eff:fec4:d286 \
0
24001 Pop SR Adj (idx 3) Gi0/0/0/0 fe80::f816:3eff:fec4:d286 \
0
24008 Pop SR Adj (idx 1) Gi0/0/0/4 fe80::f816:3eff:fea9:f6c0 \
0
24009 Pop SR Adj (idx 3) Gi0/0/0/4 fe80::f816:3eff:fea9:f6c0 \
0
Although the respective ISIS database entry is in place:
R1#sh isis database verbose R8
Mon Aug 27 11:16:40.319 UTC
IS-IS 1 (Level-2) Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
NCS-540-32.00-00 0x0000000f 0xe27f 1112 0/0/0
Area Address: 49.0000
NLPID: 0x8e
MT: IPv6 Unicast 0/0/0
Hostname: R8
IPv6 Address: 2001:db8::8
Metric: 10 MT (IPv6 Unicast) IS-Extended R2.00
ADJ-SID: F:1 B:1 V:1 L:1 S:0 weight:0 Adjacency-sid:24000
ADJ-SID: F:1 B:0 V:1 L:1 S:0 weight:0 Adjacency-sid:24001
Metric: 10 MT (IPv6 Unicast) IS-Extended R7.00
ADJ-SID: F:1 B:1 V:1 L:1 S:0 weight:0 Adjacency-sid:24002
ADJ-SID: F:1 B:0 V:1 L:1 S:0 weight:0 Adjacency-sid:24003
Metric: 0 MT (IPv6 Unicast) IPv6 2001:db8::8/128
Prefix-SID Index: 8, Algorithm:0, R:0 N:1 P:0 E:0 V:0 L:0
My question now is, is this a bug in the VIRL IOS-XR image, or am I missing something?
Thanks,
Thomas
