Hi, I've run into a very annoying issue that I'm having a hard time understanding. In short, our ISIS metrics on backbone links (dual-stack) are being automatically adjusted to the max ISIS metric size (16m or 33m) despite the fact that all of our links have a defined metric of 20 (see below) on both the A and B sides. With IPv4 routes (unicast/multicast) the correct metric is applied as well as with certain IPv6 unicast/multicast routes in the ISIS table. All our PE routers are ASR9K running IOS-XR 6.6.3 with several MX2K in the "core" leading the show.
Any ideas?
RP/0/RSP0/CPU0:rtr-091#sh route ipv6 un isis
Thu Feb 18 23:13:53.117 France
i L1 xxxx:yyy:2401::1/128
[115/16777214] via fe80::217:cb00:a6d7:d0a4, 6w0d, TenGigE0/1/0/8.166
[115/16777214] via fe80::217:cb00:a4d7:d61e, 6w0d, TenGigE0/0/0/8.164
i L1 xxxx:yyy:2401::2/128
[115/16777218] via fe80::217:cb00:a6d7:d0a4, 9w3d, TenGigE0/1/0/8.166
[115/16777218] via fe80::217:cb00:a4d7:d61e, 9w3d, TenGigE0/0/0/8.164
i L1 xxxx:yyy:2401:100::3/128
[115/33554467] via fe80::2aa2:4bff:fe74:7aa2, 09:59:22, TenGigE0/1/0/10
[115/33554467] via fe80::2aa2:4bff:fe74:7a77, 09:59:22, TenGigE0/1/0/8
[115/33554467] via fe80::2aa2:4bff:fe74:79e1, 09:59:22, TenGigE0/0/0/11
[115/33554467] via fe80::2aa2:4bff:fe74:79df, 09:59:22, TenGigE0/0/0/10
[115/33554467] via fe80::2aa2:4bff:fe74:79b1, 09:59:22, TenGigE0/0/0/8
---------------------------
router isis 2200
set-overload-bit on-startup 300
is-type level-1
net 49.0001.0000.0006.0031.00
nsr
nsf ietf
log adjacency changes
lsp-gen-interval maximum-wait 5000 initial-wait 1 secondary-wait 50
address-family ipv4 unicast
metric-style wide
metric-style wide level 1
mpls traffic-eng level-1
mpls traffic-eng router-id Loopback2
mpls traffic-eng multicast-intact
spf-interval maximum-wait 1000 initial-wait 1 secondary-wait 10
spf prefix-priority high tag 17
!
address-family ipv6 unicast
metric-style wide
spf-interval maximum-wait 1000 initial-wait 1 secondary-wait 10
spf prefix-priority high tag 17
interface TenGigE0/1/0/8.166
bfd minimum-interval 50
bfd multiplier 3
bfd fast-detect ipv4
point-to-point
hello-padding disable
hello-password text encrypted XYZ
lsp fast-flood threshold 200 level 1
address-family ipv4 unicast
metric 20 level 1
mpls ldp sync
!
address-family ipv6 unicast
metric 20 level 1
mpls ldp sync
....
