Hi all,
Please give some advise!
I am trying Flex-Algo on SRv6.
But the Flex-Algo policy state is "Operational: down".
And I get "No v4 endpoint" debug log.
What is the reason? And how can I fix the issue?
Does IPv4 have relation this issue?
Status is as below.
RP/0/RP0/CPU0:xr9kv-4#show segment-routing traffic-eng policy color 101
Fri Jun 28 19:44:06.814 UTC
SR-TE policy database
---------------------
Color: 101, End-point: 2001:10:129::1
Name: srte_c_101_ep_2001:10:129::1
Status:
Admin: up Operational: down for 00:33:48 (since Jun 28 19:10:18.269)
Candidate-paths:
Preference: 105 (configuration) (inactive)
Name: flex-algo
Last error: SRv6 SIDs failed verification
Requested BSID: dynamic
Constraints:
Prefix-SID Algorithm: 128
Protection Type: protected-preferred
Maximum SID Depth: 13
Dynamic (inactive)
Last error: Unsupported endpoint
Metric Type: IGP, Path Accumulated Metric: 0
SRv6 Information:
Locator: algo128
Binding SID requested: Dynamic
Binding SID behavior: uB6 (Insert.Red)
Attributes:
Forward Class: 0
Steering labeled-services disabled: no
Steering BGP disabled: no
IPv6 caps enable: yes
Invalidation drop enabled: no
Max Install Standby Candidate Paths: 0
RP/0/RP0/CPU0:xr9kv-4#
RP/0/RP0/CPU0:xr9kv-4#debug segment-routing traffic-eng error
Fri Jun 28 19:48:36.340 UTC
RP/0/RP0/CPU0:xr9kv-4#RP/0/RP0/CPU0:Jun 28 19:48:38.482 UTC: xtc_agent[1288]: DBG-Error:xtc_policy_dynamic_flex_alg:2560 (Policy: srte_c_101_ep_2001:10:129::1 #7) Not v4 endpoint
RP/0/RP0/CPU0:Jun 28 19:48:38.482 UTC: xtc_agent[1288]: DBG-Error:xtc_policy_dynamic_flex_alg:2680 (Policy: srte_c_101_ep_2001:10:129::1 #7) Path computation failed
RP/0/RP0/CPU0:Jun 28 19:48:38.482 UTC: xtc_agent[1288]: DBG-Error:xtc_policy_verify_cpath:918 No valid SLs found
The node recognizes the SRv6 locators successfully.
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:1:: | include locator
Known via "isis core", distance 115, metric 11, SRv6-locator, type level-1
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:2:: | include locator
Known via "isis core", distance 115, metric 11, SRv6-locator, type level-1
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:3:: | include locator
Known via "isis core", distance 115, metric 11, SRv6-locator, type level-1
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:129:: | include locator
Known via "isis core", distance 115, metric 31, SRv6-locator (algo 128), type level-1
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:130:: | include locator
Known via "isis core", distance 115, metric 11, SRv6-locator (algo 128), type level-1
RP/0/RP0/CPU0:xr9kv-4#show route ipv6 2001:10:131:: | include locator
Known via "isis core", distance 115, metric 21, SRv6-locator (algo 128), type level-1
I tried explicit path too, this was no problem and packets were forwarded as I intended.
RP/0/RP0/CPU0:xr9kv-4#show segment-routing traffic-eng policy color 100
Fri Jun 28 19:51:56.020 UTC
SR-TE policy database
---------------------
Color: 100, End-point: 2001:10:1::1
Name: srte_c_100_ep_2001:10:1::1
Status:
Admin: up Operational: up for 00:43:47 (since Jun 28 19:08:08.919)
Candidate-paths:
Preference: 100 (configuration) (active)
Name: 4-to-1
Requested BSID: dynamic
Constraints:
Protection Type: protected-preferred
Maximum SID Depth: 13
Explicit: segment-list 4-to-1A (valid)
Weight: 1, Metric Type: TE
SID[0]: 2001:10:2::/48
Format: f3216
LBL:32 LNL:16 FL:0 AL:80
SID[1]: 2001:10:3::/48
Format: f3216
LBL:32 LNL:16 FL:0 AL:80
SID[2]: 2001:10:1::/48
Format: f3216
LBL:32 LNL:16 FL:0 AL:80
SRv6 Information:
Locator: xr9kv4
Binding SID requested: Dynamic
Binding SID behavior: uB6 (Insert.Red)
Preference: 90 (configuration) (inactive)
Name: 4-to-1
Last error: SRv6 SIDs failed verification
Requested BSID: dynamic
Constraints:
Protection Type: protected-preferred
Maximum SID Depth: 13
Explicit: segment-list 4-to-1B (inactive)
Last error: unresolved first SID (2001:10:2::)
Weight: 1, Metric Type: TE
SID[0]: 2001:10:2::/48
SID[1]: 2001:10:1::/48
SRv6 Information:
Locator: xr9kv4
Binding SID requested: Dynamic
Binding SID behavior: uB6 (Insert.Red)
Attributes:
Binding SID: 2001:10:4:e004::
Forward Class: Not Configured
Steering labeled-services disabled: no
Steering BGP disabled: no
IPv6 caps enable: yes
Invalidation drop enabled: no
Max Install Standby Candidate Paths: 0
RP/0/RP0/CPU0:xr9kv-4#show segment-routing traffic-eng forwarding policy color 100
Fri Jun 28 19:51:28.450 UTC
SR-TE Policy Forwarding database
--------------------------------
Color: 100, End-point: 2001:10:1::1
Name: srte_c_100_ep_2001:10:1::1
Binding SID: 2001:10:4:e004::
Active LSP:
Candidate path:
Preference: 100 (configuration)
Name: 4-to-1
Segment lists:
SL[0]:
Name: 4-to-1A
SL ID: 0xa000001
Switched Packets/Bytes: ?/?
Paths:
Path[0]:
Outgoing Interfaces: GigabitEthernet0/0/0/0
Next Hop: fe80::5054:ff:fe03:0
FRR Pure Backup: No
ECMP/LFA Backup: No
SID stack (Top -> Bottom): {2001:10:2::/48, 2001:10:3::/48}
Policy Packets/Bytes Switched: ?/?
I am using XRv9000 on CML.
Configuration is below.
Fri Jun 28 20:01:49.106 UTC
!! Building configuration...
!! IOS XR Configuration 7.11.1
!! Last configuration change at Fri Jun 28 20:01:48 2024 by root123
!
hostname xr9kv-4
logging console disable
(snip)
!
vrf L3VPN
rd 10.255.0.4:20
address-family ipv4 unicast
import route-target
10.255.0.1:20
!
export route-target
10.255.0.4:20
!
!
address-family ipv6 unicast
import route-target
10.255.0.1:20
!
export route-target
10.255.0.4:20
!
!
!
address-family ipv6 unicast
!
line console
exec-timeout 0 0
absolute-timeout 0
session-timeout 0
!
line default
exec-timeout 0 0
absolute-timeout 0
session-timeout 0
!
call-home
service active
contact smart-licensing
profile CiscoTAC-1
active
destination transport-method email disable
destination transport-method http
!
!
interface Loopback0
ipv4 address 10.255.0.4 255.255.255.255
ipv6 address 2001:10:4::4/128
!
interface Loopback1
ipv4 address 10.255.0.132 255.255.255.255
ipv6 address 2001:10:132::4/128
!
interface MgmtEth0/RP0/CPU0/0
shutdown
!
interface GigabitEthernet0/0/0/0
ipv6 address 2001:2:4::4/64
!
interface GigabitEthernet0/0/0/1
ipv6 address 2001:3:4::4/64
!
interface GigabitEthernet0/0/0/2
shutdown
!
interface GigabitEthernet0/0/0/3
vrf L3VPN
ipv4 address 192.168.1.254 255.255.255.0
ipv6 address 2001:192:168:1::254/64
!
interface GigabitEthernet0/0/0/4
ipv6 address 2001:1:4::4/64
!
interface GigabitEthernet0/0/0/5
shutdown
!
interface GigabitEthernet0/0/0/6
shutdown
!
interface GigabitEthernet0/0/0/7
shutdown
!
interface GigabitEthernet0/0/0/8
shutdown
!
extcommunity-set opaque COLOR_EXT_COMMUNITY_SET
100
end-set
!
route-policy BGP_ROUTE_POLICY_v4
if destination longer-than (0.0.0.0/0) then
set extcommunity color COLOR_EXT_COMMUNITY_SET
endif
pass
end-policy
!
route-policy BGP_ROUTE_POLICY_v6
if destination longer-than (::/0) then
set extcommunity color COLOR_EXT_COMMUNITY_SET
endif
pass
end-policy
!
router isis core
is-type level-1
net 49.0000.0000.0004.00
distribute link-state
affinity-map BLUE bit-position 1
address-family ipv6 unicast
metric-style wide
advertise link attributes
router-id Loopback0
segment-routing srv6
locator xr9kv4
!
locator algo128
!
!
!
flex-algo 128
priority 250
advertise-definition
prefix-metric
affinity exclude-any BLUE
address-family ipv4 unicast
!
address-family ipv6 unicast
!
!
interface Loopback0
passive
address-family ipv6 unicast
!
!
interface Loopback1
passive
affinity flex-algo BLUE
address-family ipv6 unicast
!
!
interface GigabitEthernet0/0/0/0
point-to-point
address-family ipv6 unicast
!
!
interface GigabitEthernet0/0/0/1
affinity flex-algo BLUE
point-to-point
address-family ipv6 unicast
!
!
interface GigabitEthernet0/0/0/4
affinity flex-algo BLUE
point-to-point
address-family ipv6 unicast
!
!
!
router bgp 100
segment-routing srv6
locator xr9kv4
!
address-family ipv4 unicast
segment-routing srv6
alloc mode per-vrf
!
!
address-family vpnv4 unicast
vrf all
segment-routing srv6
alloc mode per-vrf
!
!
!
address-family ipv6 unicast
segment-routing srv6
locator xr9kv4
alloc mode per-vrf
!
!
address-family vpnv6 unicast
vrf all
segment-routing srv6
alloc mode per-vrf
!
!
!
neighbor 2001:10:1::1
remote-as 100
update-source Loopback0
address-family ipv4 unicast
encapsulation-type srv6
!
address-family vpnv4 unicast
encapsulation-type srv6
route-policy BGP_ROUTE_POLICY_v4 out
!
address-family ipv6 unicast
encapsulation-type srv6
!
address-family vpnv6 unicast
encapsulation-type srv6
route-policy BGP_ROUTE_POLICY_v6 out
!
!
vrf L3VPN
rd 10.255.0.4:20
address-family ipv4 unicast
redistribute connected
!
address-family ipv6 unicast
segment-routing srv6
!
redistribute connected
!
!
!
segment-routing
traffic-eng
srv6
locator xr9kv4 binding-sid dynamic behavior ub6-insert-reduced
!
segment-lists
srv6
sid-format usid-f3216
!
segment-list 4-to-1A
srv6
index 10 sid 2001:10:2::
index 20 sid 2001:10:3::
index 30 sid 2001:10:1::
!
!
segment-list 4-to-1B
srv6
index 10 sid 2001:10:2::
index 20 sid 2001:10:1::
!
!
!
policy 4-to-1
srv6
locator xr9kv4 binding-sid dynamic behavior ub6-insert-reduced
!
color 100 end-point ipv6 2001:10:1::1
candidate-paths
preference 90
explicit segment-list 4-to-1B
!
!
preference 100
explicit segment-list 4-to-1A
!
!
!
!
policy flex-algo
srv6
locator algo128 binding-sid dynamic behavior ub6-insert-reduced
!
source-address ipv6 2001:10:132::4
color 101 end-point ipv6 2001:10:129::1
candidate-paths
preference 105
dynamic
metric
type igp
!
!
constraints
segments
sid-algorithm 128
!
!
!
!
!
!
srv6
logging locator status
encapsulation
source-address 2001:10:4::4
!
locators
locator xr9kv4
micro-segment behavior unode psp-usd
prefix 2001:10:4::/48
!
locator algo128
micro-segment behavior unode psp-usd
prefix 2001:10:132::/48
algorithm 128
!
!
!
!
end
