Hello there,
I am trying to configure MSTP on AL 7750SR in lab environment. I couldn't find any relevant configuration that would help me. If anybody has an idea or link to resources, please let me know. Meanwhile I will try my hands on!
Thx!
MSTP Configuration on SR7750 OS 11 R4
-
guiarista
Re: MSTP Configuration on SR7750 OS 11 R4
So far I just figured MSTP requires you to set up VPLS first. I have been having trouble getting MSTP working. m-VPLS is needed for MSTP. After configuring m-VPLS, and doing "show service id 1 stp", the SAPs do not appear to be operationally up.
Does anyone know what could be the cause? I have been consulting the 7750SR OS11 R4 Service Guide, but I still have trouble getting it done.
Does anyone know what could be the cause? I have been consulting the 7750SR OS11 R4 Service Guide, but I still have trouble getting it done.
-
guiarista
Re: MSTP Configuration on SR7750 OS 11 R4
I was able to run MSTP on 3 Alcatel 7750s. The diagram is below:
………….(GW)
…………...||….….….Single port with dot1q subinterfaces (VLAN 10, 20, 30, 40 respectively)
…………...||
…………...||
…………...||….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively
(PE1)==(PE2)
...||……||….….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively on each router
...||……||
...||……||….….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively on both interfaces
....(MTU)
...//.||.||.\\….….…….Single port with SAP x/x/x: 10, 20, 30, 40 respectively
..//..||.||..\\
10.20.30.40….….….Usually a switch with trunk port going up to MTU and a host connected to the switch for VLAN 10.
………………………....Or a router with dot1q encapsulated subinterfaces (VLAN 10, 20, 30, 40 respectively)
################DEVICES######################
MTU: Alcatel Lucent 7750 SR7
PE1 and PE2: Alcatel Lucent 7750 SR c12
GW: Cisco 2621 / 2821 / usually its a random pick as I am not concentrating on GW part yet.
###############CONFIGURATION###################
PE1 and PE2 are running OSPF and LDP to exchange reachability information. The "====" denotes this link is in "network" mode. While "/", "|", or "\" denote a SAP interface.
VPLS 2 (PE1 and PE2 are peers):
mesh-sdp from PE1 to PE2 and vice versa. SAP interfaces (SAP x/x/x:10, :20, :30, and :40) from PE1-to-MTU link, from PE2-to-MTU link, and from PE2-to-GW link.
VPLS 2 (MTU):
Standalone VPLS process. No network interface. All access ports with SAP x/x/x:10, :20, :30, and :40 respectively.
VPLS 1 m-vpls (PE1 and PE2):
mesh-sdp from PE1 to PE2 and vice versa. SAP x/x/x:0 on PE1-to-MTU link. SAP x/x/x:0 on PE2-to-MTU link and PE2-to-GW link.
VPLS 1 m-vpls (MTU):
SAP x/x/x:0 on MTU-to-PE1 link and on MTU-to-PE1 link.
MSTP:
PE1 is root bridge for VLAN 10 and 20.
PE2 is root bridge for VLAN 30 and 40.
########################PROBLEM#######################
Even though "show service id 1 stp" on PE1, PE2, MTU shows nothing suspicious to me, when I try to ping from VLAN 10 under MTU to VLAN 10 on GW (basically they should be on the same LAN), it doesn't go through properly. By doing "show service fdb-mac" the MAC address for device connected to both sides of the network (on VLAN 10) keeps flapping (kinda). It keeps changing from VLAN to VLAN. The MAC address sometimes falls under :20 SAP or :30 SAP (by doing "show service fdb-mac") even though I don't have any device connected to these VLANs.
Even a single ARP doesn't go through properly. It did go once or twice ONLY one way, it never returned the ARP reply.
And there is an unusual flood of packet in the Alcatel Triangle ( PE1-PE2-MTU ).
PS: Just OSPF, MPLS, LDP, VPLS running on devices.
Any hints would be appreciated.
………….(GW)
…………...||….….….Single port with dot1q subinterfaces (VLAN 10, 20, 30, 40 respectively)
…………...||
…………...||
…………...||….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively
(PE1)==(PE2)
...||……||….….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively on each router
...||……||
...||……||….….….….Single port with SAP x/x/x:10, :20, :30, :40 respectively on both interfaces
....(MTU)
...//.||.||.\\….….…….Single port with SAP x/x/x: 10, 20, 30, 40 respectively
..//..||.||..\\
10.20.30.40….….….Usually a switch with trunk port going up to MTU and a host connected to the switch for VLAN 10.
………………………....Or a router with dot1q encapsulated subinterfaces (VLAN 10, 20, 30, 40 respectively)
################DEVICES######################
MTU: Alcatel Lucent 7750 SR7
PE1 and PE2: Alcatel Lucent 7750 SR c12
GW: Cisco 2621 / 2821 / usually its a random pick as I am not concentrating on GW part yet.
###############CONFIGURATION###################
PE1 and PE2 are running OSPF and LDP to exchange reachability information. The "====" denotes this link is in "network" mode. While "/", "|", or "\" denote a SAP interface.
VPLS 2 (PE1 and PE2 are peers):
mesh-sdp from PE1 to PE2 and vice versa. SAP interfaces (SAP x/x/x:10, :20, :30, and :40) from PE1-to-MTU link, from PE2-to-MTU link, and from PE2-to-GW link.
VPLS 2 (MTU):
Standalone VPLS process. No network interface. All access ports with SAP x/x/x:10, :20, :30, and :40 respectively.
VPLS 1 m-vpls (PE1 and PE2):
mesh-sdp from PE1 to PE2 and vice versa. SAP x/x/x:0 on PE1-to-MTU link. SAP x/x/x:0 on PE2-to-MTU link and PE2-to-GW link.
VPLS 1 m-vpls (MTU):
SAP x/x/x:0 on MTU-to-PE1 link and on MTU-to-PE1 link.
MSTP:
PE1 is root bridge for VLAN 10 and 20.
PE2 is root bridge for VLAN 30 and 40.
########################PROBLEM#######################
Even though "show service id 1 stp" on PE1, PE2, MTU shows nothing suspicious to me, when I try to ping from VLAN 10 under MTU to VLAN 10 on GW (basically they should be on the same LAN), it doesn't go through properly. By doing "show service fdb-mac" the MAC address for device connected to both sides of the network (on VLAN 10) keeps flapping (kinda). It keeps changing from VLAN to VLAN. The MAC address sometimes falls under :20 SAP or :30 SAP (by doing "show service fdb-mac") even though I don't have any device connected to these VLANs.
Even a single ARP doesn't go through properly. It did go once or twice ONLY one way, it never returned the ARP reply.
And there is an unusual flood of packet in the Alcatel Triangle ( PE1-PE2-MTU ).
PS: Just OSPF, MPLS, LDP, VPLS running on devices.
Any hints would be appreciated.
