Date created: Tuesday, September 2, 2014 5:08:23 PM. Last modified: Thursday, November 11, 2021 10:16:38 AM
Pseudowire - Basic Backup Pseudowire
Test machines T1 and T2 are on the same IP subnet and connected to their relivant CPEs. The LAN interfaces on each CPE is a bridge group to a VLAN on the WAN (3-way bridge on CPE1). The PEs operate the redundant pseudowire feature (over MPLS) between the dual access-circuits at PE1 and single AC at PE2.
This basic setup has no BFD checking and it's a Y shape AC redundancy topology (SPoF).
c7200-adventerprisek9-mz.152-4.S5
! PE1 ! pseudowire-class mpls-class encapsulation mpls interworking ethernet ! interface FastEthernet0/0.20 encapsulation dot1Q 20 xconnect 10.0.0.2 12345 encapsulation mpls pw-class mpls-class ! interface FastEthernet0/1.20 encapsulation dot1Q 20 xconnect 10.0.0.2 67890 encapsulation mpls pw-class mpls-class ! PE2 ! pseudowire-class mpls-class encapsulation mpls interworking ethernet ! interface FastEthernet0/0.20 encapsulation dot1Q 20 xconnect 10.0.0.1 12345 encapsulation mpls pw-class mpls-class backup peer 10.0.0.1 67890 pw-class mpls-class backup delay 5 never ! CPE1 ! interface FastEthernet0/0.20 encapsulation dot1Q 20 bridge-group 20 ! interface FastEthernet0/1.20 encapsulation dot1Q 20 bridge-group 20 ! interface FastEthernet1/0 no ip address speed auto duplex auto bridge-group 20 ! interface BVI20 no ip address ! bridge 20 protocol ieee bridge 20 route ip ! T1 ! interface FastEthernet0/0 ip address 192.168.5.4 255.255.255.0
PE1 and PE2 agree on PWE3 status;
PE1#show xconnect all detail
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP pri ac Fa0/0.20:20(Eth VLAN) UP mpls 10.0.0.2:12345 UP
Interworking: ethernet Local VC label 19
Remote VC label 20
pw-class: mpls-class
SB pri ac Fa0/1.20:20(Eth VLAN) UP mpls 10.0.0.2:67890 SB
Interworking: ethernet Local VC label 21
Remote VC label 21
pw-class: mpls-class
PE2#show xconnect all detail
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP pri ac Fa0/0.20:20(Eth VLAN) UP mpls 10.0.0.1:12345 UP
Interworking: ethernet Local VC label 20
Remote VC label 19
pw-class: mpls-class
IA sec ac Fa0/0.20:20(Eth VLAN) UP mpls 10.0.0.1:67890 SB
Interworking: ethernet Local VC label 21
Remote VC label 21
pw-class: mpls-class
When pinging from T1 to T2 both CPEs can see both test machine MACs
T1#show ip arp Protocol Address Age (min) Hardware Addr Type Interface Internet 192.168.5.4 - ca01.0c4c.0008 ARPA FastEthernet0/0 Internet 192.168.5.5 7 ca02.0c4c.0008 ARPA FastEthernet0/0
CPE1#show bridge 20 verbose Total of 300 station blocks, 298 free Codes: P - permanent, S - self BG Hash Address Action Interface VC Age RX count TX count 20 08/0 ca02.0c4c.0008 forward Fa0/0.20 - 0 266 289 20 08/1 ca01.0c4c.0008 forward FastEthernet1/0 - 0 291 264 Flood ports RX count TX count FastEthernet0/0.20 1 1 FastEthernet0/1.20 0 2 FastEthernet1/0 1 1
T2#show ip arp Protocol Address Age (min) Hardware Addr Type Interface Internet 192.168.5.4 7 ca01.0c4c.0008 ARPA FastEthernet0/0 Internet 192.168.5.5 - ca02.0c4c.0008 ARPA FastEthernet0/0
CPE2#show bridge 20 verbose Total of 300 station blocks, 298 free Codes: P - permanent, S - self BG Hash Address Action Interface VC Age RX count TX count 20 08/0 ca02.0c4c.0008 forward FastEthernet1/0 - 2 1 0 20 08/1 ca01.0c4c.0008 forward Fa0/0.20 - 2 1 0 Flood ports RX count TX count FastEthernet0/0.20 1 1 FastEthernet1/0 1 1
Shutdown of primary AC on PE1 (fa0/0.20) causes the backup (fa0/1.20) to automatically become active
PE1#conf t
PE1(config)#int fa0/0.20
PE1(config-subif)#shut
PE1#show xconnect all detail
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
AD pri ac Fa0/0.20:20(Eth VLAN) AD mpls 10.0.0.2:12345 DN
Interworking: ethernet Local VC label unassigned
Remote VC label 20
pw-class: mpls-class
SB pri ac Fa0/1.20:20(Eth VLAN) UP mpls 10.0.0.2:67890 SB
Interworking: ethernet Local VC label 21
Remote VC label 21
pw-class: mpls-class
PE1#show xconnect all detail
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
AD pri ac Fa0/0.20:20(Eth VLAN) AD mpls 10.0.0.2:12345 DN
Interworking: ethernet Local VC label unassigned
Remote VC label 20
pw-class: mpls-class
UP pri ac Fa0/1.20:20(Eth VLAN) UP mpls 10.0.0.2:67890 UP
Interworking: ethernet Local VC label 21
Remote VC label 21
pw-class: mpls-class
PE2#show xconnect all detail
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
IA pri ac Fa0/0.20:20(Eth VLAN) UP mpls 10.0.0.1:12345 DN
Interworking: ethernet Local VC label 20
Remote VC label unassigned
pw-class: mpls-class
UP sec ac Fa0/0.20:20(Eth VLAN) UP mpls 10.0.0.1:67890 UP
Interworking: ethernet Local VC label 21
Remote VC label 21
pw-class: mpls-class
CPE re-learns the MAC on bridge 20 via the alternate WAN access port (fa0/1.20) and connectivity continues
CPE1#show bridge 20 verbose Total of 300 station blocks, 298 free Codes: P - permanent, S - self BG Hash Address Action Interface VC Age RX count TX count 20 08/0 ca02.0c4c.0008 forward Fa0/1.20 - 1 1 0 20 08/1 ca01.0c4c.0008 forward FastEthernet1/0 - 4 1 0 Flood ports RX count TX count FastEthernet0/0.20 1 6 FastEthernet0/1.20 2 5 FastEthernet1/0 4 3
Previous page: MPLS over PHY vs EFP+BDI/SVI
Next page: PWE3 Access/Untagged