Hi Experts,
Lets see if anyone can help me shed some light on this weird issue in Vol 3 Lab
7T ticket two. The solution is to setup a EBGP multi hop neighbor relationship
between R8 and R2 and I understand all of that. The problem is what my routers
are doing and it is driving me nuts.
R2 will not form a BGP neighbor relationship with R8 in fact it cannot ping R8
via the BGP route. If I replace the BGP route with a temporary static route or
disable CEF then everything works as expected.
I notice that the BGP route contains a label while the static route does not, I
also understand that MPLS requires CEF so by disabling CEF I am probably
bypassing MPLS. Therefore I think the weirdness relates to MPLS but I cannot
for the life of me figure it out. Lots and lots of show commands below.....
Any ideas what Im doing wrong?
Thanks
Patrick A Baldwin
R2#sh ip cef
%IPv4 CEF not running
R2#sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
B 1.1.1.1 [20/0] via 24.1.1.1, 05:07:56
24.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
C 24.24.1.0/24 is directly connected, GigabitEthernet0/1.24
C 24.24.2.0/24 is directly connected, Serial1/1
O IA 24.56.45.0/24 [110/49] via 24.24.1.4, 05:08:26, GigabitEthernet0/1.24
C 24.1.1.0/24 is directly connected, GigabitEthernet0/1.201
C 24.1.1.1/32 is directly connected, GigabitEthernet0/1.201
C 24.24.24.2/32 is directly connected, Loopback0
O 24.24.24.4/32 [110/2] via 24.24.1.4, 05:08:27, GigabitEthernet0/1.24
78.0.0.0/32 is subnetted, 2 subnets
B 78.78.78.8 [20/0] via 24.1.1.1, 05:07:57
B 78.78.78.7 [20/0] via 78.78.78.8, 04:26:23
56.0.0.0/32 is subnetted, 2 subnets
O E2 56.56.56.5 [110/20] via 24.24.1.4, 05:08:29, GigabitEthernet0/1.24
B 56.56.56.6 [200/0] via 24.24.24.4, 05:07:59
R2#sh ip ro 78.78.78.8
Routing entry for 78.78.78.8/32
Known via "bgp 24", distance 20, metric 0
Tag 1, type external
Last update from 24.1.1.1 05:08:41 ago
Routing Descriptor Blocks:
* 24.1.1.1, from 24.1.1.1, 05:08:41 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 1
R2#sh ip ro 24.1.1.1
Routing entry for 24.1.1.1/32
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via bgp 24
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet0/1.201
Route metric is 0, traffic share count is 1
R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 24.1.1.1 71 000c.8532.8500 ARPA
GigabitEthernet0/1.201
Internet 24.1.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.201
Internet 24.24.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.24
Internet 24.24.1.4 72 001b.54fb.a5c9 ARPA
GigabitEthernet0/1.24
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#ip cef
R2(config)#exit
R2#
R2#sh ip cef adj g0/1.201 24.1.1.1
24.1.1.1/32
attached to GigabitEthernet0/1.201
R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 24.1.1.1 72 000c.8532.8500 ARPA
GigabitEthernet0/1.201
Internet 24.1.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.201
Internet 24.24.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.24
Internet 24.24.1.4 72 001b.54fb.a5c9 ARPA
GigabitEthernet0/1.24
R2#sh ip ro 24.1.1.1
Routing entry for 24.1.1.1/32
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via bgp 24
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet0/1.201
Route metric is 0, traffic share count is 1
R2#sh ip ro 78.78.78.8
Routing entry for 78.78.78.8/32
Known via "bgp 24", distance 20, metric 0
Tag 1, type external
Last update from 24.1.1.1 05:10:59 ago
Routing Descriptor Blocks:
* 24.1.1.1, from 24.1.1.1, 05:10:59 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 1
R2#sh bgp sum
BGP router identifier 24.24.24.2, local AS number 24
BGP table version is 10, main routing table version 10
7 network entries using 924 bytes of memory
8 path entries using 416 bytes of memory
11/6 BGP path/bestpath attribute entries using 1848 bytes of memory
5 BGP AS-PATH entries using 120 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 6 (at peak 6) using 192 bytes of memory
BGP using 3500 total bytes of memory
BGP activity 14/0 prefixes, 15/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
24.1.1.1 4 1 321 318 10 0 0 05:12:21
2
24.24.24.4 4 24 318 318 10 0 0 05:11:34
3
78.78.78.8 4 78 274 275 10 0 0 04:29:37
2
R2#ping 24.1.1.1 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 24.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
R2#ping 78.78.78.8 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
.....
Success rate is 0 percent (0/5)
R2#
*Jun 28 18:05:43.522: %BGP-3-NOTIFICATION: received from neighbor 78.78.78.8
4/0 (hold time expired) 0 bytes
R2#
*Jun 28 18:05:43.522: %BGP-5-ADJCHANGE: neighbor 78.78.78.8 Down BGP
Notification received
R2#ping 24.1.1.1 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 24.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
R2#sh ip cef
Prefix Next Hop Interface
0.0.0.0/0 no route
0.0.0.0/8 drop
0.0.0.0/32 receive
1.1.1.1/32 24.1.1.1 GigabitEthernet0/1.201
24.1.1.0/24 attached GigabitEthernet0/1.201
24.1.1.0/32 receive GigabitEthernet0/1.201
24.1.1.1/32 attached GigabitEthernet0/1.201
24.1.1.2/32 receive GigabitEthernet0/1.201
24.1.1.255/32 receive GigabitEthernet0/1.201
24.24.1.0/24 attached GigabitEthernet0/1.24
24.24.1.0/32 receive GigabitEthernet0/1.24
24.24.1.2/32 receive GigabitEthernet0/1.24
24.24.1.4/32 attached GigabitEthernet0/1.24
24.24.1.255/32 receive GigabitEthernet0/1.24
24.24.2.0/24 attached Serial1/1
24.24.2.0/32 receive Serial1/1
24.24.2.2/32 receive Serial1/1
24.24.2.4/32 attached Serial1/1
24.24.2.255/32 receive Serial1/1
24.24.24.2/32 receive Loopback0
24.24.24.4/32 24.24.1.4 GigabitEthernet0/1.24
24.56.45.0/24 24.24.1.4 GigabitEthernet0/1.24
Prefix Next Hop Interface
56.56.56.5/32 24.24.1.4 GigabitEthernet0/1.24
56.56.56.6/32 24.24.1.4 GigabitEthernet0/1.24
78.78.78.8/32 24.1.1.1 GigabitEthernet0/1.201
127.0.0.0/8 drop
224.0.0.0/4 multicast
224.0.0.0/24 receive
240.0.0.0/4 drop
255.255.255.255/32 receive
R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 24.1.1.1 74 000c.8532.8500 ARPA
GigabitEthernet0/1.201
Internet 24.1.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.201
Internet 24.24.1.2 - 0012.d9dd.671b ARPA
GigabitEthernet0/1.24
Internet 24.24.1.4 75 001b.54fb.a5c9 ARPA
GigabitEthernet0/1.24
R2#sh mpls forwarding-table 78.78.78.8 det
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
None 275228 78.78.78.8/32 0 drop
MAC/Encaps=0/4, MRU=0, Label Stack{275228}
4331C000
No output feature configured
R2#debug cef all
All CEF debugging is on
*Jun 28 18:11:20.542: FIBif: Processing queued interface events
*Jun 28 18:11:20.542: FIBif: [sw:<unknown>(11) 67D2F71C] Coming up
*Jun 28 18:11:20.542: FIBif: [sw:<unknown>(11) 67D2F71C] Failed: Interface not
really up
*Jun 28 18:11:20.542: FIBif: Restarting queued interface events
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path list
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:2
R2#ping 78.1.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking path list
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path list
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[connid=1048577]
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking path
list
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Locked path list
*Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=none]
*Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Unlocking path list
R2#ping 78.78.78.8 so 24.24.
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path list
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
R2#ping 78.78.78.8 so 24.24.24.
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking path
list
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path list
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[connid=1048577]
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking path
list
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Locked path list
*Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=none]
*Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Unlocking path list
R2#ping 78.78.78.8 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
*Jun 28 18:11:35.542: FIBif: Processing queued interface events
*Jun 28 18:11:35.542: FIBif: [sw:<unknown>(11) 67D2F71C] Coming up
*Jun 28 18:11:35.542: FIBif: [sw:<unknown>(11) 67D2F71C] Failed: Interface not
really up
*Jun 28 18:11:35.542: FIBif: Restarting queued interface events...
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path list
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking path
list
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path list
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking path
list
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path list
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[connid=1048577]
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking path
list
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Locked path list
*Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=none]
*Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
683F41F4(3)] Unlocking path list..
Success rate is 0 percent (0/5)
R2#
R2#u all
All possible debugging has been turned off
R2#sh mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
20 No Label 56.56.56.6/32 0 Gi0/1.24 24.24.1.4
R2#sh cef fib
30 allocated IPv4 entries, 0 failed allocations
11 allocated IPv6 entries, 0 failed allocations
R2#sh cef int
GigabitEthernet0/1 is up (if_number 2)
Corresponding hwidb fast_if_number 13
Corresponding hwidb firstsw->if_number 2
Internet Protocol processing disabled
Hardware idb is GigabitEthernet0/1
Fast switching type 1, interface type 27
IP CEF switching enabled
IP CEF switching turbo vector
IP CEF turbo switching turbo vector
IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
Input fast flags 0x0, Output fast flags 0x0
ifindex 7(7)
Slot Slot unit 1 VC -1
Transmit limit accumulator 0x0 (0x0)
IP MTU 0
GigabitEthernet0/2 is down (if_number 3)
Corresponding hwidb fast_if_number 3
Corresponding hwidb firstsw->if_number 3
Internet Protocol processing disabled
Hardware idb is GigabitEthernet0/2
Fast switching type 1, interface type 27
IP CEF switching enabled
IP CEF switching turbo vector
IP CEF turbo switching turbo vector
IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
Input fast flags 0x0, Output fast flags 0x0
ifindex 8(8)
Slot Slot unit 2 VC -1
Transmit limit accumulator 0x0 (0x0)
IP MTU 0
GigabitEthernet0/3 is down (if_number 4)
Corresponding hwidb fast_if_number 4
Corresponding hwidb firstsw->if_number 4
R2#sh run int g0/1.201
Building configuration...
Current configuration : 145 bytes
!
interface GigabitEthernet0/1.201
encapsulation dot1Q 201
ip address 24.1.1.2 255.255.255.0
ip pim bsr-border
ip pim sparse-dense-mode
end
R2#sh run int g0/1
Building configuration...
Current configuration : 111 bytes
!
interface GigabitEthernet0/1
no ip address
duplex full
speed auto
media-type gbic
negotiation auto
end
R2#sh ip int br
Interface IP-Address OK? Method Status
Protocol
GigabitEthernet0/1 unassigned YES NVRAM up up
GigabitEthernet0/1.24 24.24.1.2 YES NVRAM up up
GigabitEthernet0/1.201 24.1.1.2 YES NVRAM up up
GigabitEthernet0/2 unassigned YES NVRAM administratively down down
GigabitEthernet0/3 unassigned YES NVRAM administratively down down
Serial1/0 unassigned YES NVRAM administratively down down
Serial1/1 24.24.2.2 YES NVRAM up up
Serial1/2 unassigned YES NVRAM administratively down down
Serial1/3 unassigned YES NVRAM administratively down down
Loopback0 24.24.24.2 YES NVRAM up up
Tunnel0 unassigned YES unset up up
R2#sh mpls for
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
20 No Label 56.56.56.6/32 0 Gi0/1.24 24.24.1.4
R2#sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
B 1.1.1.1 [20/0] via 24.1.1.1, 05:21:22
24.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
C 24.24.1.0/24 is directly connected, GigabitEthernet0/1.24
C 24.24.2.0/24 is directly connected, Serial1/1
O IA 24.56.45.0/24 [110/49] via 24.24.1.4, 05:21:52, GigabitEthernet0/1.24
C 24.1.1.0/24 is directly connected, GigabitEthernet0/1.201
C 24.1.1.1/32 is directly connected, GigabitEthernet0/1.201
C 24.24.24.2/32 is directly connected, Loopback0
O 24.24.24.4/32 [110/2] via 24.24.1.4, 05:21:53, GigabitEthernet0/1.24
78.0.0.0/32 is subnetted, 1 subnets
B 78.78.78.8 [20/0] via 24.1.1.1, 05:21:23
56.0.0.0/32 is subnetted, 2 subnets
R2#ping 78.78.78.8 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
.....
Success rate is 0 percent (0/5)
R2#sh mpls int
Interface IP Tunnel BGP Static Operational
GigabitEthernet0/1.201 No No Yes No Yes
R2#sh run int g0/1.201
Building configuration...
Current configuration : 166 bytes
!
interface GigabitEthernet0/1.201
encapsulation dot1Q 201
ip address 24.1.1.2 255.255.255.0
ip pim bsr-border
ip pim sparse-dense-mode
mpls bgp forwarding
end
R2#sh run | sec bgp
mpls bgp forwarding
router bgp 24
bgp router-id 24.24.24.2
bgp log-neighbor-changes
neighbor 24.1.1.1 remote-as 1
neighbor 24.24.24.4 remote-as 24
neighbor 24.24.24.4 update-source Loopback0
neighbor 78.78.78.8 remote-as 78
neighbor 78.78.78.8 ebgp-multihop 255
neighbor 78.78.78.8 update-source Loopback0
!
address-family ipv4
redistribute connected route-map Loop0
neighbor 24.1.1.1 activate
neighbor 24.1.1.1 send-label
neighbor 24.24.24.4 activate
neighbor 24.24.24.4 next-hop-self
neighbor 78.78.78.8 activate
neighbor 78.78.78.8 route-map no-l0 in
no auto-summary
no synchronization
exit-address-family
!
address-family ipv4 multicast
neighbor 24.1.1.1 activate
neighbor 24.24.24.4 activate
neighbor 24.24.24.4 next-hop-self
no auto-summary
network 24.24.24.2 mask 255.255.255.255
exit-address-family
R2#
R2#sh mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
16 No Label 56.56.56.5/32 0 Gi0/1.24 24.24.1.4
17 Pop Label 24.1.1.1/32 0 Gi0/1.201 24.1.1.1
18 No Label 24.24.24.4/32 0 Gi0/1.24 24.24.1.4
19 No Label 24.56.45.0/24 0 Gi0/1.24 24.24.1.4
20 No Label 56.56.56.6/32 0 Gi0/1.24 24.24.1.4
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#no ip cef
R2(config)#^Z
R2#
*Jun 28 19:54:45.594: %SYS-5-CONFIG_I: Configured from console by console
R2#ping 78.78.78.8 so 24.24.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
Packet sent with a source address of 24.24.24.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
R2#
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