Hello! Maybe does somebody know a book consisting of a good description of IGMPv3? There is only one document which I have been able to find  - rfc 3376, but, there is some details of protocol which I cannot understand because of short description without examples. I will be very glad if somebody helps me.  ... View more

I cannot find any information about MRU parameter except the book "Mpls fundamentals" where there is some explanation about sense of this parameter however it is not clear enough. Can somebody explain me how it works? I cannot understand whether MRU is calculated locally or it is exchanged between routers. According to some very restricted notices I have been able to find, MRU have to be exchanged, however, all my experiments was not able to confirm such behaviour. All what I can see is that PHP-router makes its MRU 4 bytes more than others LSR.  ... View more

I have several vlan and cat 3750 with SVI-interfaces in my network. There is DHCP-server in one of the VLAN and cat3750 uses ip-helper on every SVI to forward DHCP-packets from PC to DHCP-server. When I connect windows-host it get ip-address from DHCP-server and it's all right. When I assign a static IP-address to this host from the same subnet as IP from appropriate SVI it works fine and I don't have any problem. If I try to assign to host a static IP address from another subnet then IP from SVI host get APPIPA address from range 169.254.0.0. I can't assign any static IP from any subnet which differs on subnet from appropriate SVI-interface. Why does it happen? ... View more

I have PIM router which connects to the cat 2960 switch and also I have host which connects to another port on the same switch. Host was joined to the IGMP group 224.1.1.1. I see that the router generates igmp-query and the host respons. IGMP-snooping process sees that process and updates appropriate entries: 2960-5#sh ip igmp snooping mrouter Vlan    ports ----    -----   15    Gi2/0/32(dynamic)   2960-5#sh ip igmp snooping groups 15        224.1.1.1                igmp        v2          Gi2/0/32, Gi2/0/33   But when I command "sh mac address-table multicast" I see nothing: 2960#sh mac address-table multicast Vlan    Mac Address       Type        Ports ----    -----------       ----        -----   What is reason of this problem? ... View more

I'm choosing router for brunch office among this models  - 887VA-SEC-K9 or 887VA-K9. I want this router to can IPSEC site-to-site, GRE-tunnels and OSPF. I read the datasheet but I haven't understood several things about this model so I can't choose a right model. The datasheet says that default software is Advanced Security Feature Set for all 887 routers which supports IPSEC and GRE. Then I don't understand what are differences between 887VA-SEC-K9 or 887VA-K9? What does the word "SEC" mean? The second things aren't understood - I want the router to support OSPF. The Advanced IP Services can do it but there is two options too - SL-880-AIS and L-SL-800-SEC-K9. What are differences between them? What should I choose to implement IPSEC-GRE-OSPF among this models and licenses? ... View more

Hello! I have two EIGRP routers - R1(192.168.0.1) and R2(192.168.0.2). R1 have two lo-interface. lo1 network - 1.1.1.0 is injecting to eigrp by using redistribut command. lo2-network - 2.2.2.0 is injecting to eigrp by using network command. As the result, R2 have following route table: 1.0.0.0/24 is subnetted, 1 subnets D EX 1.1.1.0 [170/156160] via 192.168.0.1, 00:15:09, FastEthernet0/0 C 192.168.0.0 is directly connected, FastEthernet0/0 2.0.0.0/24 is subnetted, 1 subnets D 2.2.2.0 [90/156160] via 192.168.0.1, 00:15:09, FastEthernet0/0 I am doing follow command: access-list 10 permit 1.1.1.0 0.0.0.255 access-list 10 permit 2.2.2.0 0.0.0.255 router eigrp 100 distance 20 192.168.0.0 0.0.0.255 10 As the result, R2 have following route table: 1.0.0.0/24 is subnetted, 1 subnets D EX 1.1.1.0 [170/156160] via 192.168.0.1, 00:15:09, FastEthernet0/0 C 192.168.0.0 is directly connected, FastEthernet0/0 2.0.0.0/24 is subnetted, 1 subnets D 2.2.2.0 [20/156160] via 192.168.0.1, 00:15:09, FastEthernet0/0 AD for internal EIGRP network 2.2.2.0 is chsnging and equal 20. But AD for external network 1.1.1.0 isn't changing and equal 170. How set ad. distance for external eigrp? Show access-list: Standard IP access list 10 10 permit 1.1.1.0, wildcard bits 0.0.0.255 (2 matches) 20 permit 2.2.2.0, wildcard bits 0.0.0.255 (2 matches) ... View more