रूटिंग टेबल का विश्लेषण, या फिर पायथन नेटवर्क इंजीनियर क्यों

 S* 0.0.0.0/0 [1/0] via 10.220.88.1 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 10.220.88.0/24 is directly connected, FastEthernet4 L 10.220.88.20/32 is directly connected, FastEthernet4 1.0.0.0/32 is subnetted, 1 subnets S 1.1.1.1 [1/0] via 212.0.0.1 [1/0] via 192.168.0.1 D EX 10.1.198.0/24 [170/1683712] via 172.16.209.47, 1w2d, Vlan910 [170/1683712] via 172.16.60.33, 1w2d, Vlan60 [170/1683712] via 10.25.20.132, 1w2d, Vlan220 [170/1683712] via 10.25.20.9, 1w2d, Vlan20 4.0.0.0/16 is subnetted, 1 subnets O E2 4.4.0.0 [110/20] via 194.0.0.2, 00:02:00, FastEthernet0/0 5.0.0.0/24 is subnetted, 1 subnets D EX 5.5.5.0 [170/2297856] via 10.0.1.2, 00:12:01, Serial0/0 6.0.0.0/16 is subnetted, 1 subnets B 6.6.0.0 [200/0] via 195.0.0.1, 00:00:04 172.16.0.0/26 is subnetted, 1 subnets i L2 172.16.1.0 [115/10] via 10.0.1.2, Serial0/0 172.20.0.0/32 is subnetted, 3 subnets O 172.20.1.1 [110/11] via 194.0.0.2, 00:05:45, FastEthernet0/0 O 172.20.3.1 [110/11] via 194.0.0.2, 00:05:45, FastEthernet0/0 O 172.20.2.1 [110/11] via 194.0.0.2, 00:05:45, FastEthernet0/0 10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks C 10.0.1.0/24 is directly connected, Serial0/0 D 10.0.5.0/26 [90/2297856] via 10.0.1.2, 00:12:03, Serial0/0 D 10.0.5.64/26 [90/2297856] via 10.0.1.2, 00:12:03, Serial0/0 D 10.0.5.128/26 [90/2297856] via 10.0.1.2, 00:12:03, Serial0/0 D 10.0.5.192/27 [90/2297856] via 10.0.1.2, 00:12:03, Serial0/0 192.168.0.0/32 is subnetted, 1 subnets D 192.168.0.1 [90/2297856] via 10.0.1.2, 00:12:03, Serial0/0 O IA 195.0.0.0/24 [110/11] via 194.0.0.2, 00:05:45, FastEthernet0/0 O E2 212.0.0.0/8 [110/20] via 194.0.0.2, 00:05:35, FastEthernet0/0 C 194.0.0.0/16 is directly connected, FastEthernet0/0 

 S 10.1.1.0 255.255.255.0 [3/0] via 10.86.194.1, outside C 10.86.194.0 255.255.254.0 is directly connected, outside S* 0.0.0.0 0.0.0.0 [1/0] via 10.86.194.1, outside 

 import os import re import SubnetTree from time import time # Path to directory with routing table files. # Each routing table MUST be in separate .txt file. RT_DIRECTORY = "./routing_tables" # RegEx template string for IPv4 address matching. REGEXP_IPv4_STR = ( '((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' + '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' + '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' + '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))' ) # IPv4 CIDR notation matching in user input. REGEXP_INPUT_IPv4 = re.compile("^" + REGEXP_IPv4_STR + "(\/\d\d?)?$") # Local and Connected route strings matching. REGEXP_ROUTE_LOCAL_CONNECTED = re.compile( '^(?P<routeType>[L|C])\s+' + '((?P<ipaddress>\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?)' + '\s?' + '(?P<maskOrPrefixLength>(\/\d\d?)?' + '|(\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?)?))' + '\ is\ directly\ connected\,\ ' + '(?P<interface>\S+)', re.MULTILINE ) # Static and dynamic route strings matching. REGEXP_ROUTE = re.compile( '^(\S\S?\*?\s?\S?\S?)' + '\s+' + '((?P<subnet>\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?)' + '\s?' + '(?P<maskOrPrefixLength>(\/\d\d?)?' +'|(\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?)?))' + '\s*' + '(?P<viaPortion>(?:\n?\s+(\[\d\d?\d?\/\d+\])\s+' + 'via\s+(\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?)(.*)\n?)+)', re.MULTILINE ) # Route string VIA portion matching. REGEXP_VIA_PORTION = re.compile( '.*via\s+(\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?).*' ) # Store for 'router' objects generated from input routing table files. # Each file is represented by single 'router' object. # Router is referenced by Router ID (RID). # RID is filename by default. # Format: # # ROUTERS = { # 'RID1': {'routing_table': {}, 'interface_list': ()}, # 'RID_N': {'routing_table': {}, 'interface_list': ()}, # } # ROUTERS = {} # Global search tree for Interface IP address to Router ID (RID) resolving. # Stores Interface IP addresses as keys. # Returns (RID, interfaceID) list. # Interface IP addresses SHOULD be globally unique across inspected topology. GLOBAL_INTERFACE_TREE = SubnetTree.SubnetTree() def parse_show_ip_route_ios_like(raw_routing_table): """ Parser for routing table text output. Compatible with both Cisco IOS(IOS-XE) 'show ip route' and Cisco ASA 'show route' output format. Processes input text file and writes into Python data structures. Builds internal SubnetTree search tree in 'route_tree'. Generates local interface list for router in 'interface_list' Returns 'router' dictionary object with parsed data. """ router = {} route_tree = SubnetTree.SubnetTree() interface_list = [] # Parse Local and Connected route strings in text. for raw_route_string in REGEXP_ROUTE_LOCAL_CONNECTED.finditer(raw_routing_table): subnet = ( raw_route_string.group('ipaddress') + convert_netmask_to_prefix_length( raw_route_string.group('maskOrPrefixLength') ) ) interface = raw_route_string.group('interface') route_tree[subnet] = ((interface,), raw_route_string.group(0)) if raw_route_string.group('routeType') == 'L': interface_list.append((interface, subnet,)) if not interface_list: print('Failed to find routing table entries in given output') return None # parse static and dynamic route strings in text for raw_route_string in REGEXP_ROUTE.finditer(raw_routing_table): subnet = ( raw_route_string.group('subnet') + convert_netmask_to_prefix_length( raw_route_string.group('maskOrPrefixLength') ) ) via_portion = raw_route_string.group('viaPortion') next_hops= [] if via_portion.count('via') > 1: for line in via_portion.splitlines(): if line: next_hops.append(REGEXP_VIA_PORTION.match(line).group(1)) else: next_hops.append(REGEXP_VIA_PORTION.match(via_portion).group(1)) route_tree[subnet] = (next_hops, raw_route_string.group(0)) router = { 'routing_table': route_tree, 'interface_list': interface_list, } return router def parse_text_routing_table(raw_routing_table): """ Parser functions wrapper. Add additional parsers for alternative routing table syntaxes here. """ router = parse_show_ip_route_ios_like(raw_routing_table) if router: return router def convert_netmask_to_prefix_length(mask_or_pref): """ Gets subnet_mask (XXX.XXX.XXX.XXX) of /prefix_length (/XX). For subnet_mask, converts it to /prefix_length and returns result. For /prefix_length, returns as is. For empty input, returns "" string. """ if not mask_or_pref: return "" if re.match("^\/\d\d?$", mask_or_pref): return mask_or_pref if re.match("^\d\d?\d?\.\d\d?\d?\.\d\d?\d?\.\d\d?\d?$", mask_or_pref): return ( "/" + str(sum([bin(int(x)).count("1") for x in mask_or_pref.split(".")])) ) return "" def route_lookup(destination, router): """ Performs route_tree lookup in passed router object for passed destination subnet. Returns list of next_hops with original route strings or (None,None) depending on lookup result. """ if destination in router['routing_table']: return router['routing_table'][destination] else: return (None, None) def get_rid_by_interface_ip(interface_ip): """Returns RouterID by Interface IP address which it belongs to.""" if interface_ip in GLOBAL_INTERFACE_TREE: return GLOBAL_INTERFACE_TREE[interface_ip][0] def nexthop_is_local(next_hop): """ Check if nexthop points to local interface. Will be True for Connected and Local route strings on Cisco devices. """ interface_types = ('Eth', 'Fast', 'Gig', 'Ten', 'Port', 'Serial', 'Vlan', 'Tunn', 'Loop', 'Null' ) for type in interface_types: if next_hop.startswith(type): return True def trace_route(source_router_id, target_ip, path=[]): """ Performs recursive path search from source Router ID (RID) to target subnet. Returns tuple of path tuples. Each path tuple contains a sequence of Router IDs with matched route strings. Multiple paths are supported. """ if not source_router_id: return [path + [(None, None)]] current_router = ROUTERS[source_router_id] next_hop, raw_route_string = route_lookup(target_ip, current_router) path = path + [(source_router_id, raw_route_string)] paths = [] if next_hop: if nexthop_is_local(next_hop[0]): return [path] for nh in next_hop: next_hop_rid = get_rid_by_interface_ip(nh) if not next_hop_rid in [r[0] for r in path]: inner_path = trace_route(next_hop_rid, target_ip, path) for p in inner_path: paths.append(p) else: path = path + [(next_hop_rid+"<<LOOP DETECTED", None)] return [path] else: return [path] return paths def do_parse_directory(rt_directory): """ Go through specified directory and parse all .txt files. Generate router objects based on parse result if any. Populate new_routers with those router objects. Default key for each router object is FILENAME. Return new_routers. """ new_routers = {} if not os.path.isdir(rt_directory): print("{} directory does not exist.".format(rt_directory) + "Check rt_directory variable value." ) return None start_time = time() print("Initializing files...") for FILENAME in os.listdir(rt_directory): if FILENAME.endswith('.txt'): file_init_start_time = time() with open(os.path.join(rt_directory, FILENAME), 'r') as f: print ('Opening {}'.format(FILENAME)) raw_table = f.read() new_router = parse_text_routing_table(raw_table) router_id = FILENAME.replace('.txt', '') if new_router: new_routers[router_id] = new_router if new_router['interface_list']: for iface, addr in new_router['interface_list']: GLOBAL_INTERFACE_TREE[addr]= (router_id, iface,) else: print ('Failed to parse ' + FILENAME) print (FILENAME + " parsing has been completed in {} sec".format( "{:.3f}".format(time() - file_init_start_time)) ) else: if not new_routers: print ("Could not find any valid .txt files with routing tables" + " in {} directory".format(rt_directory) ) else: print ("\nAll files have been initialized" + " in {} sec".format("{:.3f}".format(time() - start_time)) ) return new_routers def do_user_interactive_search(): """ Provides interactive search dialog for user. Asks user for target subnet or host in CIDR notation. Validates input. Prints error and goes back to start for invalid input. Executes path search to given target from each router in global ROUTERS. Prints formatted path search result. Goes back to start. """ while True: print ('\n') target_subnet = raw_input('Enter Target Subnet or Host: ') if not target_subnet: continue if not REGEXP_INPUT_IPv4.match(target_subnet.replace(' ', '')): print ("incorrect input") continue lookup_start_time = time() for rtr in ROUTERS.keys(): subsearch_start_time = time() result = trace_route(rtr, target_subnet) if result: print ("\n") print ("PATHS TO {} FROM {}".format(target_subnet, rtr)) n = 1 print ('Detailed info:') for r in result: print ("Path {}:".format(n)) print ([h[0] for h in r]) for hop in r: print ("ROUTER: {}".format(hop[0])) print ("Matched route string: \n{}".format(hop[1])) else: print ('\n') n+=1 else: print ("Path search on {} has been completed in {} sec".format( rtr, "{:.3f}".format(time() - subsearch_start_time)) ) else: print ("\nFull search has been completed in {} sec".format( "{:.3f}".format(time() - lookup_start_time),) ) def main(): global ROUTERS ROUTERS = do_parse_directory(RT_DIRECTORY) if ROUTERS: do_user_interactive_search() if __name__ == "__main__": main() 

 Codes: L - local, 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, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set S 10.0.0.0/8 [1/0] via 192.168.142.2 [1/0] via 192.168.141.2 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks C 172.16.114.0/24 is directly connected, GigabitEthernet2 L 172.16.114.5/32 is directly connected, GigabitEthernet2 192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.2.0/24 is directly connected, GigabitEthernet1 L 192.168.2.201/32 is directly connected, GigabitEthernet1 192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.12.0/24 is directly connected, GigabitEthernet2 L 192.168.12.201/32 is directly connected, GigabitEthernet2 192.168.13.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.13.0/24 is directly connected, GigabitEthernet3 L 192.168.13.201/32 is directly connected, GigabitEthernet3 D 192.168.24.0/24 [90/3072] via 192.168.12.202, 00:06:56, GigabitEthernet2 D 192.168.34.0/24 [90/3072] via 192.168.13.203, 00:06:56, GigabitEthernet3 192.168.141.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.141.0/30 is directly connected, Tunnel141 L 192.168.141.1/32 is directly connected, Tunnel141 192.168.142.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.142.0/30 is directly connected, Tunnel142 L 192.168.142.1/32 is directly connected, Tunnel142 192.168.201.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.201.0/24 is directly connected, Loopback201 L 192.168.201.201/32 is directly connected, Loopback201 D 192.168.202.0/24 [90/130816] via 192.168.12.202, 00:05:44, GigabitEthernet2 D 192.168.203.0/24 [90/130816] via 192.168.13.203, 00:06:22, GigabitEthernet3 D 192.168.204.0/24 [90/131072] via 192.168.13.203, 00:06:56, GigabitEthernet3 [90/131072] via 192.168.12.202, 00:06:56, GigabitEthernet2 

 Codes: L - local, 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, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.2.0/24 is directly connected, GigabitEthernet1 L 192.168.2.202/32 is directly connected, GigabitEthernet1 192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.12.0/24 is directly connected, GigabitEthernet2 L 192.168.12.202/32 is directly connected, GigabitEthernet2 D 192.168.13.0/24 [90/3072] via 192.168.12.201, 00:46:17, GigabitEthernet2 192.168.24.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.24.0/24 is directly connected, GigabitEthernet3 L 192.168.24.202/32 is directly connected, GigabitEthernet3 D 192.168.34.0/24 [90/3072] via 192.168.24.204, 00:46:15, GigabitEthernet3 D 192.168.201.0/24 [90/130816] via 192.168.12.201, 00:36:59, GigabitEthernet2 192.168.202.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.202.0/24 is directly connected, Loopback202 L 192.168.202.202/32 is directly connected, Loopback202 D 192.168.203.0/24 [90/131072] via 192.168.24.204, 00:06:31, GigabitEthernet3 [90/131072] via 192.168.12.201, 00:06:31, GigabitEthernet2 D 192.168.204.0/24 [90/130816] via 192.168.24.204, 00:37:26, GigabitEthernet3 

 Codes: L - local, 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, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.2.0/24 is directly connected, GigabitEthernet1 L 192.168.2.203/32 is directly connected, GigabitEthernet1 D 192.168.12.0/24 [90/3072] via 192.168.13.201, 00:46:12, GigabitEthernet3 192.168.13.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.13.0/24 is directly connected, GigabitEthernet3 L 192.168.13.203/32 is directly connected, GigabitEthernet3 D 192.168.24.0/24 [90/3072] via 192.168.34.204, 00:46:12, GigabitEthernet2 192.168.34.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.34.0/24 is directly connected, GigabitEthernet2 L 192.168.34.203/32 is directly connected, GigabitEthernet2 D 192.168.201.0/24 [90/130816] via 192.168.13.201, 00:36:56, GigabitEthernet3 D 192.168.202.0/24 [90/131072] via 192.168.34.204, 00:05:51, GigabitEthernet2 [90/131072] via 192.168.13.201, 00:05:51, GigabitEthernet3 192.168.203.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.203.0/24 is directly connected, Loopback203 L 192.168.203.203/32 is directly connected, Loopback203 D 192.168.204.0/24 [90/130816] via 192.168.34.204, 00:37:22, GigabitEthernet2 

 Codes: L - local, 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, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set S 10.0.0.0/8 [1/0] via 192.168.142.1 [1/0] via 192.168.141.1 192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.2.0/24 is directly connected, GigabitEthernet1 L 192.168.2.204/32 is directly connected, GigabitEthernet1 D 192.168.12.0/24 [90/3072] via 192.168.24.202, 00:46:17, GigabitEthernet3 D 192.168.13.0/24 [90/3072] via 192.168.34.203, 00:46:19, GigabitEthernet2 192.168.24.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.24.0/24 is directly connected, GigabitEthernet3 L 192.168.24.204/32 is directly connected, GigabitEthernet3 192.168.34.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.34.0/24 is directly connected, GigabitEthernet2 L 192.168.34.204/32 is directly connected, GigabitEthernet2 192.168.141.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.141.0/30 is directly connected, Tunnel141 L 192.168.141.2/32 is directly connected, Tunnel141 192.168.142.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.142.0/30 is directly connected, Tunnel142 L 192.168.142.2/32 is directly connected, Tunnel142 D 192.168.201.0/24 [90/131072] via 192.168.34.203, 00:37:02, GigabitEthernet2 [90/131072] via 192.168.24.202, 00:37:02, GigabitEthernet3 D 192.168.202.0/24 [90/130816] via 192.168.24.202, 00:05:57, GigabitEthernet3 D 192.168.203.0/24 [90/130816] via 192.168.34.203, 00:06:34, GigabitEthernet2 192.168.204.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.204.0/24 is directly connected, Loopback204 L 192.168.204.204/32 is directly connected, Loopback204 

 $ python2.7 traceRouteByShowIPRoute.py Initializing files... Opening csr1000v-01.txt csr1000v-01.txt parsing has been completed in 0.001 sec Opening csr1000v-02.txt csr1000v-02.txt parsing has been completed in 0.001 sec Opening csr1000v-03.txt csr1000v-03.txt parsing has been completed in 0.001 sec Opening csr1000v-04.txt csr1000v-04.txt parsing has been completed in 0.001 sec All files have been initialized in 0.003 sec Enter Target Subnet or Host: 

IP- .

 Enter Target Subnet or Host: 192.168.204.204 PATHS TO 192.168.204.204 FROM csr1000v-04 Detailed info: Path 1: ['csr1000v-04'] ROUTER: csr1000v-04 Matched route string: L 192.168.204.204/32 is directly connected, Loopback204 Path search on csr1000v-04 has been completed in 0.000 sec PATHS TO 192.168.204.204 FROM csr1000v-03 Detailed info: Path 1: ['csr1000v-03', 'csr1000v-04'] ROUTER: csr1000v-03 Matched route string: D 192.168.204.0/24 [90/130816] via 192.168.34.204, 00:37:22, GigabitEthernet2 ROUTER: csr1000v-04 Matched route string: L 192.168.204.204/32 is directly connected, Loopback204 Path search on csr1000v-03 has been completed in 0.000 sec PATHS TO 192.168.204.204 FROM csr1000v-02 Detailed info: Path 1: ['csr1000v-02', 'csr1000v-04'] ROUTER: csr1000v-02 Matched route string: D 192.168.204.0/24 [90/130816] via 192.168.24.204, 00:37:26, GigabitEthernet3 ROUTER: csr1000v-04 Matched route string: L 192.168.204.204/32 is directly connected, Loopback204 Path search on csr1000v-02 has been completed in 0.000 sec PATHS TO 192.168.204.204 FROM csr1000v-01 Detailed info: Path 1: ['csr1000v-01', 'csr1000v-03', 'csr1000v-04'] ROUTER: csr1000v-01 Matched route string: D 192.168.204.0/24 [90/131072] via 192.168.13.203, 00:06:56, GigabitEthernet3 [90/131072] via 192.168.12.202, 00:06:56, GigabitEthernet2 ROUTER: csr1000v-03 Matched route string: D 192.168.204.0/24 [90/130816] via 192.168.34.204, 00:37:22, GigabitEthernet2 ROUTER: csr1000v-04 Matched route string: L 192.168.204.204/32 is directly connected, Loopback204 Path 2: ['csr1000v-01', 'csr1000v-02', 'csr1000v-04'] ROUTER: csr1000v-01 Matched route string: D 192.168.204.0/24 [90/131072] via 192.168.13.203, 00:06:56, GigabitEthernet3 [90/131072] via 192.168.12.202, 00:06:56, GigabitEthernet2 ROUTER: csr1000v-02 Matched route string: D 192.168.204.0/24 [90/130816] via 192.168.24.204, 00:37:26, GigabitEthernet3 ROUTER: csr1000v-04 Matched route string: L 192.168.204.204/32 is directly connected, Loopback204 Path search on csr1000v-01 has been completed in 0.000 sec Full search has been completed in 0.001 sec 

, . :

 csr1000v-01#show ip route 192.168.204.204 Routing entry for 192.168.204.0/24 Known via "eigrp 200", distance 90, metric 131072, type internal Redistributing via eigrp 200 Last update from 192.168.13.203 on GigabitEthernet3, 00:02:15 ago Routing Descriptor Blocks: 192.168.13.203, from 192.168.13.203, 00:02:15 ago, via GigabitEthernet3 Route metric is 131072, traffic share count is 1 Total delay is 5020 microseconds, minimum bandwidth is 1000000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 2 * 192.168.12.202, from 192.168.12.202, 00:02:15 ago, via GigabitEthernet2 Route metric is 131072, traffic share count is 1 Total delay is 5020 microseconds, minimum bandwidth is 1000000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 2 

csr1000v-01 equal-cost EIGRP csr1000v-02 csr1000v-03.
, : ['csr1000v-01', 'csr1000v-03', 'csr1000v-04'] ['csr1000v-01', 'csr1000v-02', 'csr1000v-04'].

 csr1000v-02#show ip route 192.168.204.204 Routing entry for 192.168.204.0/24 Known via "eigrp 200", distance 90, metric 130816, type internal Redistributing via eigrp 200 Last update from 192.168.24.204 on GigabitEthernet3, 00:08:48 ago Routing Descriptor Blocks: * 192.168.24.204, from 192.168.24.204, 00:08:48 ago, via GigabitEthernet3 Route metric is 130816, traffic share count is 1 Total delay is 5010 microseconds, minimum bandwidth is 1000000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 1 

 csr1000v-3#show ip route 192.168.204.204 Routing entry for 192.168.204.0/24 Known via "eigrp 200", distance 90, metric 130816, type internal Redistributing via eigrp 200 Last update from 192.168.34.204 on GigabitEthernet2, 00:08:45 ago Routing Descriptor Blocks: * 192.168.34.204, from 192.168.34.204, 00:08:45 ago, via GigabitEthernet2 Route metric is 130816, traffic share count is 1 Total delay is 5010 microseconds, minimum bandwidth is 1000000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 1 

csr1000v-2 csr1000v-3 EIGRP csr1000v-4.
, : ['csr1000v-02', 'csr1000v-04'] ['csr1000v-03', 'csr1000v-04'] .

 csr1000v-04#show ip route 192.168.204.204 Routing entry for 192.168.204.204/32 Known via "connected", distance 0, metric 0 (connected) Routing Descriptor Blocks: * directly connected, via Loopback204 Route metric is 0, traffic share count is 1 

csr1000v-4 Connnected Loopback204.
Local : ['csr1000v-04'].

 Enter Target Subnet or Host: 10.10.10.0/24 PATHS TO 10.10.10.0/24 FROM csr1000v-04 Detailed info: Path 1: ['csr1000v-04', 'csr1000v-01', 'csr1000v-04<<LOOP DETECTED'] ROUTER: csr1000v-04 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.1 [1/0] via 192.168.141.1 ROUTER: csr1000v-01 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.2 [1/0] via 192.168.141.2 ROUTER: csr1000v-04<<LOOP DETECTED Matched route string: None Path 2: ['csr1000v-04', 'csr1000v-01', 'csr1000v-04<<LOOP DETECTED'] ROUTER: csr1000v-04 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.1 [1/0] via 192.168.141.1 ROUTER: csr1000v-01 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.2 [1/0] via 192.168.141.2 ROUTER: csr1000v-04<<LOOP DETECTED Matched route string: None Path search on csr1000v-04 has been completed in 0.000 sec PATHS TO 10.10.10.0/24 FROM csr1000v-03 Detailed info: Path 1: ['csr1000v-03'] ROUTER: csr1000v-03 Matched route string: None Path search on csr1000v-03 has been completed in 0.000 sec PATHS TO 10.10.10.0/24 FROM csr1000v-02 Detailed info: Path 1: ['csr1000v-02'] ROUTER: csr1000v-02 Matched route string: None Path search on csr1000v-02 has been completed in 0.000 sec PATHS TO 10.10.10.0/24 FROM csr1000v-01 Detailed info: Path 1: ['csr1000v-01', 'csr1000v-04', 'csr1000v-01<<LOOP DETECTED'] ROUTER: csr1000v-01 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.2 [1/0] via 192.168.141.2 ROUTER: csr1000v-04 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.1 [1/0] via 192.168.141.1 ROUTER: csr1000v-01<<LOOP DETECTED Matched route string: None Path 2: ['csr1000v-01', 'csr1000v-04', 'csr1000v-01<<LOOP DETECTED'] ROUTER: csr1000v-01 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.2 [1/0] via 192.168.141.2 ROUTER: csr1000v-04 Matched route string: S 10.0.0.0/8 [1/0] via 192.168.142.1 [1/0] via 192.168.141.1 ROUTER: csr1000v-01<<LOOP DETECTED Matched route string: None Path search on csr1000v-01 has been completed in 0.003 sec Full search has been completed in 0.004 sec 

.
:

 csr1000v-01#show ip route 10.10.10.0 255.255.255.0 Routing entry for 10.0.0.0/8 Known via "static", distance 1, metric 0 Routing Descriptor Blocks: * 192.168.142.2 Route metric is 0, traffic share count is 1 192.168.141.2 Route metric is 0, traffic share count is 1 

 csr1000v-04#show ip route 10.10.10.0 255.255.255.0 Routing entry for 10.0.0.0/8 Known via "static", distance 1, metric 0 Routing Descriptor Blocks: 192.168.142.1 Route metric is 0, traffic share count is 1 * 192.168.141.1 Route metric is 0, traffic share count is 1 

csr1000v-01 csr1000v-04 GRE- 10.0.0.0/8. .
:

 PATHS TO 10.10.10.0/24 FROM csr1000v-01 Path 1: ['csr1000v-01', 'csr1000v-04', 'csr1000v-01<<LOOP DETECTED'] Path 2: ['csr1000v-01', 'csr1000v-04', 'csr1000v-01<<LOOP DETECTED'] PATHS TO 10.10.10.0/24 FROM csr1000v-04 Path 1: ['csr1000v-04', 'csr1000v-01', 'csr1000v-04<<LOOP DETECTED'] Path 2: ['csr1000v-04', 'csr1000v-01', 'csr1000v-04<<LOOP DETECTED'] 

 csr1000v-02#show ip route 10.10.10.0 255.255.255.0 % Network not in table 

 csr1000v-3#show ip route 10.10.10.0 255.255.255.0 % Network not in table 

csr1000v-02 csr1000v-03 . .